This question is an exact duplicate of:
Somehow I got logged out of Chat and SE in general recently. I logged back into Super User successfully using Chrome, but when I went to Root Access I was told that I need to log in to chat:
So I hit login, used my StackExchange ID, and got punted to... StackOverflow to 'add a login'?
Well, that was weird but at least I'm logged in to chat now, right? Or not:
I tried again but the process repeated itself. I also tried logging in via https://stackexchange.com but that also punted me back to SO without logging me in. Same effect after deleting all related cookies and incognito mode*.
A bit of searching dug up Unable to log in to chat.stackoverflow.com, which seemed promising. So I went to post a query on Meta about this - I had to log in to Meta as well - and started writing.
Loading up chat now shows me as logged in! I tried this again and was able to replicate.
What gives? I recently joined an SO Team, perhaps this has something to do with it?
- logged out
log into chat using StackExchange ID
- redirected to SO 'add a login'
- still not logged in to chat
log into Meta
- chat now logged in
Why does logging in to Chat (or StackExchange) redirect me to StackOverflow 'add a login'? And why can I log in to chat via Meta?
*: I wanted to test via Firefox but ran into a different issue there ("3rd party cookies seem to be disabled" → log in manually → StackExchange OpenID "Not found") which I can create another question for.