[ZGDUwpqEWpUZ]

Were you using SMS 2FA? Probably related to this: https://blog.twitter.com/en_us/topics/product/2023/an-update...

[nfriedly]

Yep, that was it.

I now have re-enabled it with an authenticator app. Set up is at https://twitter.com/settings/account/login_verification if anyone else needs the link.