Had major problems uploading last night, just like @Map_HeRo. I tried logging in and out and then it worked for a short time. But next CS will be problematic again. I then switched to the direct link from iD, there a successful upload, then again no access (same message) - around midnight I gave up…
This morning I was able to do various little things straight away, hope it stays that way for the rest of the day!
I often struggle with loading problems here in the province on the outskirts of the city, but I thought (until now) that was more due to Telekom .
Translated with DeepL.com (free version)