E2EE not working in qa version of the app

### ⚠️ Before posting ⚠️

- [X] This is a **bug**, not a question or an enhancement.
- [X] I've [searched for similar issues](https://github.com/nextcloud/android/issues) and didn't find a duplicate.
- [X] I've written a clear and descriptive title for this issue, not just "Bug" or "Crash".
- [X] I agree to follow Nextcloud's [Code of Conduct](https://nextcloud.com/contribute/code-of-conduct/).

### Steps to reproduce

1. Build the qa version of the app (qaDebug build variable) or download an auto generated version from any PR
2. Try opening an encrypted folder (encrypted with working version of the app)

### Expected behaviour

The app should ask for the password to encrypt the folder

### Actual behaviour

The app opens the creating new key pair dialog and shows a new passphrase. When continuing, an error shows that the keys could not be saved.

### Android version

12

### Device brand and model

OnePlus Nord 2

### Stock or custom OS?

Stock

### Nextcloud android app version

current master

### Nextcloud server version

28

### Using a reverse proxy?

I don't know

### Android logs

_No response_

### Server error logs

_No response_

### Additional information

Could be a server issue, rejecting all requests from not official clients? Just an idea...