Problems resolving DOIs and starting sync

My desktop version of Zotero (7.0.11 64-bit) is not able to import new items from dois (also from dois for which data have been successfully imported in the past). It also does not allow me starting sync although I am sure I use the right credentials which I copy paste from my password safe). Any idea what I could do?

Already removed and installed anew and restarted the computer etc. I have no problem with logging into the online app.
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