Authorization via plugin OIDC

[BlinCT]

Hello everybody.
The essence of my question concerns authorization via OIDC.
Partially succeeded in Jellyfin via oidc in authentik, found some materials on the Internet + on the official authentik website, authorization passes. But then the message "Error. Check permissions." pops up in the browser. I haven't been able to dig up any information yet about why this happens.
Can anyone help me find a solution?

[steelable]

Check Authentik permissions – Ensure correct scopes (openid, profile, email) and group mappings.
Jellyfin config – Verify User Info Endpoint and claims (sub, name, email). Enable auto-user creation if needed.
Review logs – Look for 401 or 403 errors in Jellyfin logs.
Test OIDC response – Use Postman or curl to confirm claims from Authentik.