Yep, happened to me too. I thought it was some kind of a browser issue. I guess I was wrong...

What about Collabora Office?

Same here

Should this work on an Android device (I am using a brave browser), or just on desktop?

It gives me a GPT3.5turbo and GPT4 options. Not sure what's "turbo".

I am just a regular 3.5 user

I've added an API Key and still getting: An error occurred while fetching a response.

Another vote for Bitwarden