Claude app keeps saying “Sorry, try again later” / login issues on iPhone 11

I’m having a weird issue with the Claude app on my iPhone 11.
About 2 weeks ago I installed the app and it worked normally at first. Then at some point, when I tried to open it again, I got a message like “Sorry, try again later” and couldn’t access anything.
I deleted and reinstalled the app, but the problem stayed the same.
Yesterday, something strange happened: the app suddenly worked again after I logged in using a different Google account. That worked without any issues.
However, today when I switched back to my original Google account, the same problem came back and I got locked out again with the same “try again later” type message.
It feels like:
one Google account works
the other gets blocked or stuck in a failed login state
reinstalling the app doesn’t fix it
Has anyone seen this before or knows what’s causing it? Is this an account issue, a device issue, or something with Claude’s authentication system?