have you followed the instructions here?
https://docs.mau.fi/bridges/python/telegram/authentication.html
this section specifically mentions:
Telegram officially discontinued registration from 3rd party clients as of 2023-02-18, so support for it was removed in v0.13.0 of the bridge. You should sign up using a mobile client and then log into the bridge.
so not sure if that's the issue you're running into (the timing matches up, anyways).
i've never used the telegram bridge myself, but i have other bridges running successfully.