Have you tried a total reset of Cura Connect from your printer, @mediTEC? Definitely recommend it. It usually resolves Cura Connect issues. Another thing to consider might be completely uninstalling and reinstalling Cura on your computer, but I'd try the reset on the printer first.
I had the same problem. Probably a bug in Cura connect which is hard to track down.
Somewhere in the maintance menu there is an option to reset Cura connect. This solved the problem for me.
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