"This user already exists." on OIDC Login

[mhutter]

Hi! I have a Miniflux installed, and configured to use OIDC authentication via rauthy. Everything worked well I could authenticate using rauthy.

However today I signed out and tried to sign in again, and now I just get the message "This user already exists." when I'm redirected to Miniflux.

Any Idea how to investigate this issue?