Authentication timed out

Configuration
1

Since last weekend I guess, my Backups failed for the Cloud. I checked the log:
Upload failed for cloud.cloud: Failed to upload backup Timeout while renewing access token

So I then logged out from HA Cloud, and when I want to login, I get an error:
Authentication timed out.

Since nothing changed on my network side, where can I get more information what is going wrong?
Log does not appear with new messages so far on the HA Cloud topic, except for:
A timeout of 10 was reached while trying to fetch subscription information-
AND
A timeout of 10 was reached while trying to fetch subscription information

2

any one had any luck with this issue? I still cannot log into the Nabu Casa cloud. on 2026.9.2

3

following this guide seem to fix the problem. https://support.nabucasa.com/hc/en-us/articles/25620486925085-Unable-to-reach-Home-Assistant-Cloud