Twitter login doesn't work

[NewJerseyStyle]

Old issue reported again from a pol.is user from Japan:
I'd like to tell that Twitter login (for proposing comment) seems broken, it just shows up "Internal Server Error".
In technical terms, OAuth callback endpoint seems like failing.

Additional context:

Patcon mentioned that Partici.app/PolisPilot uses keycloak for authorization https://gitlab.com/betabreak/polispilot/demo-keycloak-theme
https://gitlab.com/particiapp/particiapp-docker
https://www.keycloak.org/

It supports lots of social login providers:
https://medium.com/@elamarane90/keycloak-with-social-login-using-google-authentication-part-1-408d5eea73f6

So may be we can consider to adopt. Or maybe we can migrate to polis pilot UI?