There is a discussion at https://github.com/plankanban/planka/issues/1754

⚠️ Breaking changes — read before updating

1. OIDC/SSO has been removed from PLANKA Community.

    After updating, all SSO-based users are deactivated, because they no longer
    have a password login.
    An admin can restore access by setting a password for each affected user and
    reactivating them.
    If your only admin account is SSO-based, you will be locked out. Create a
    new admin user first (via script or environment variables) before updating:
    https://docs.planka.cloud/docs/configuration/admin-user
    If SSO is critical for your team, plan this migration before you update.
    Background and reasoning: #1754 · OIDC/SSO is now part of PLANKA Pro:
    https://planka.app/pro