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FYI: If you rely on the fever plug-in to connect e.g. the Reeder app on iOS: It already has been updated to accommodate the recent code changes in TT-RSS.
https://github.com/DigitalDJ/tinytinyrss-fever-plugin
See also https://forum.cloudron.io/topic/10293/cannot-login-after-switch-to-oidc/21