[BUG] Token request with `Bearer` returns error

[jesmrec]

Steps to reproduce

1. Add an oCIS account
2. Add another oCIS account over the same server
3. Repeat operation 2.

Actual behaviour

After adding >1 accounts on the same oCIS server, error Unsuccessful authorization in login view. This is happening because /konnect/v1/token request sends the Authorization header with a Bearer token instead of Basic. Token sent in request header is not valid yet because a valid token will come from the subsequent response.

Expected behaviour

Users can add as many accounts as they wish over the same or different server with no errors.

owncloud.2023-06-19.log

Pixel 2
Android 11
b86a19ea9