Updated October 28, 2026
In Assassin's Creed Black Flag Resynced, the Claiming What's Due quest sends Edward Kenway into a guarded prison area during the search for the Sage. You'll need to obtain the Havana Prison Key from the warden, but having the key doesn't always mean you can immediately open the barred prison door.
If the game displays “WARNING: Become anonymous to interact,” Edward is still attracting enemy attention. You must break contact with the guards before using the key.
This guide explains how to find the warden, obtain the prison key, clear the door warning, and complete the quest.
Quick Answer: How to Unlock the Prison Door
To unlock the prison door during Claiming What's Due:
- Follow the Rescue the Sage objective into the guarded courtyard.
- Locate the warden marked by a yellow key icon.
- Defeat the warden and obtain the Havana Prison Key.
- Follow the objective marker to the barred prison gate.
- If “Become anonymous to interact” appears, move away from the entrance.
- Break the guards' line of sight and crouch behind nearby cover until the active alert subsides.
- Return to the gate and select Unlock Door (Triangle on PlayStation).
The key point: The Havana Prison Key gives you access to the door, but Edward must also be anonymous before the interaction can succeed.
Havana Prison Key Location: Find the Warden
During Claiming What's Due, the objective tracker displays Rescue the Sage along with two useful hints:
- He is held in a prison
- The warden has the prison key
The warden is among the guards in the prison courtyard. Look for the yellow key icon identifying the enemy carrying the key.
How to Obtain the Havana Prison Key
- Enter the guarded courtyard and locate the yellow key marker.
- Approach the warden while watching for attacks from surrounding guards.
- Defeat the key-carrying enemy.
- Obtain the Havana Prison Key during the encounter.
- Check that the objective tracker updates to Prison key obtained.
The courtyard can become crowded with enemies, so avoid rushing directly toward the key marker while several guards are attacking. Create some space, deal with immediate threats, and focus on the warden when you have an opening.
Once the key is acquired, the quest tracker confirms your progress with Prison key obtained.
Tip: If you're unsure whether you already collected the correct key, check the objective tracker before searching the courtyard again.
How to Fix “Become Anonymous to Interact”
After obtaining the Havana Prison Key, follow the objective marker to the prison entrance.
When you approach the barred gate, the Unlock Door prompt may appear alongside this message:
WARNING: Become anonymous to interact
This warning means Edward cannot use the door while the game still considers him detected or engaged by enemies.
You don't need to look for another key. Instead, you need to lose enemy attention.
Step 1: Move Away From the Prison Gate
If the warning appears, stop trying to interact with the door.
Move away from the entrance and back toward the surrounding courtyard or connecting passage. Trying to unlock the gate while guards are actively pursuing Edward won't clear the restriction.
Step 2: Break the Guards' Line of Sight
Use the nearby stone walls and corners to get out of sight.
One useful hiding position is a stone corner outside the prison entrance. Move behind it and crouch so that approaching guards cannot easily see Edward.
If an enemy follows you, create more distance or deal with the immediate threat before attempting the door again.
Step 3: Wait for the Alert to Subside
Stay out of sight and watch the detection indicator.
As Edward breaks contact with the guards, the active combat alert begins to subside. A change in the indicator is a useful sign that enemy attention is decreasing, but it doesn't necessarily mean the door is ready immediately.
Avoid running straight back into a guard's view while the alert is still active.
Step 4: Return to the Door
Once Edward is no longer actively detected, return to the barred gate.
Approach the interaction point again. If the anonymous-status warning has disappeared, you can use Unlock Door to continue.
Important: Simply having the Havana Prison Key is not enough. The door interaction also requires Edward to be anonymous.
How to Unlock the Prison Door
With the Havana Prison Key acquired and enemy attention cleared, follow the objective marker to the prison entrance.
Look for the tall barred metal gate inside a torchlit stone doorway.
Approach the gate and use the interaction shown on screen:
Triangle — Unlock Door (PlayStation)
This advances the mission into the next story sequence.
If the interaction becomes unavailable again, check whether nearby guards have spotted Edward. You may need to move away, lose detection, and return once more.
There is no need to search for a second prison key or a separate lockpicking item after the quest tracker confirms Prison key obtained.
Do You Need to Kill Every Guard?
You don't need to treat the entire courtyard as a mandatory eliminate-all-enemies encounter.
The prison door's explicit interaction requirement is that Edward must become anonymous.
You may have to fight guards who are actively attacking or pursuing you, but the objective does not instruct you to defeat every enemy before opening the gate.
If you already have the Havana Prison Key, focus on breaking enemy attention rather than chasing guards throughout the courtyard.
What Happens After Opening the Door?
Unlocking the prison entrance advances Claiming What's Due into a story sequence.
Although the mission objective says Rescue the Sage, the situation is not resolved through a straightforward escort mission.
Minor Story Spoilers
Edward encounters Laureano Torres, who questions him about his identity and the Sage's whereabouts. The confrontation also involves Julien du Casse.
Following the confrontation and subsequent story scenes, the game displays:
QUEST COMPLETED — Claiming What's Due
You do not need to complete a separate playable Sage escort sequence after the prison-door interaction to reach this completion point.
Claiming What's Due Troubleshooting
If you're still having trouble progressing, check the following common situations.
| Problem | Solution |
|---|---|
| Can't find the prison key | Locate the warden marked by the yellow key icon in the courtyard. |
| Not sure whether you have the key | Check whether the quest tracker says Prison key obtained. |
| Door says “Become anonymous to interact” | Retreat, break enemy line of sight, and wait for the alert to subside. |
| Unlock Door prompt disappears | Check for nearby enemies and clear your detection status. |
| Can't find the prison entrance | Follow the objective marker to the barred gate in the torchlit stone doorway. |
Is the Prison Door Bugged?
The “Become anonymous to interact” warning is a normal interaction restriction. It does not automatically mean the quest is broken.
Before assuming there's a bug, confirm that:
- The Havana Prison Key has been obtained.
- The objective tracker says Prison key obtained.
- Edward is no longer actively detected by nearby guards.
- You're interacting with the correct barred prison gate.
If all these conditions appear to be met and the door remains unusable, try moving away and approaching it again. Reloading your latest save is another general troubleshooting option, although it is not a guaranteed fix for a specific quest bug.
Frequently Asked Questions
Where is the Havana Prison Key in Black Flag Resynced?
The Havana Prison Key is obtained during the warden encounter in the prison courtyard in Claiming What's Due. Look for the yellow key icon identifying the key-carrying enemy.
How do I become anonymous in Claiming What's Due?
Move away from the prison gate, break the guards' line of sight, and crouch behind nearby cover. Wait until the active alert subsides before returning to the door.
Why can't I unlock the prison door even though I have the key?
Edward is probably still detected or engaged by nearby guards. If “Become anonymous to interact” appears, lose enemy attention before trying again.
Do I need another key to open the prison door?
No second key is indicated once the objective tracker says Prison key obtained. The remaining requirement is to become anonymous.
Do I have to kill every guard?
The quest does not present eliminating every guard as a separate door-unlock objective. You need the warden's key and an anonymous status to use the gate.
Does Edward rescue the Sage after opening the door?
The prison-door interaction leads into a story confrontation rather than a separate playable Sage escort sequence. The mission completes after the subsequent story events.
What if the prison door still won't unlock?
Check that you have the Havana Prison Key, make sure Edward is no longer detected, and approach the gate again. If the interaction remains unavailable, try reloading your latest save.
Final Tips
The two requirements for progressing through Claiming What's Due are straightforward: obtain the Havana Prison Key from the warden and become anonymous before unlocking the prison gate.
If the door refuses to open, check Edward's detection status before searching for another item.
For more Assassin's Creed Black Flag Resynced help, especially when preparing for another playthrough, see these guides:
- How to Start NG+ Without Losing Your Save — prepare for New Game Plus while keeping your existing progress safe.
- How to Farm Escudos in New Game Plus — learn how to build up Escudos for NG+ purchases.
- How to Convert Reales to Escudos in NG+ — find out how the currency exchange works.
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