
When I start Connect IQ SDK manager I'm logged in though.

When I start Connect IQ SDK manager I'm logged in though.
No only after the new version was installed and today. Win 11.
That's a known change which was called out in the SDK changelog.
VS Code > command palette (CTRL/CMD-SHIFT-P) > Monkey C: View Documentation > README

I still don't understand how it's possible for older ERA viewers to work, unless credentials really aren't necessary for the ERA, or if the older ERA viewers use credentials that are already cached elsewhere (but why would the change be necessary in that case).
Maybe it's possible that older ERA viewers will stop working at some point, and this is just some transition phase.
I still don't understand how it's possible for older ERA viewers to work, unless credentials really aren't necessary for the ERA, or if the older ERA viewers use credentials that are already cached elsewhere (but why would the change be necessary in that case).
With regard to the error I got I think it used the login credentials from the Connect IQ SDK manager.
That's a known change which was called out in the SDK changelog.
I'm aware of that and was already logged in to ERA, I got this error when I already was in the ERA and browsing from one watch face to another.