For some reason Pass and QtPass stopped working. I tried many things, however what worked was to run:
> pass init KEY-NUMBERS-HERE
In order to get the keys do this:
> gpg --list-keys
Now select a suitable key.
For some reason you have to enter the gpg password in a terminal before QtPass works. Here I need a workaround, that's unpractical.
PS: June 29th 2023
QtPass stopped working after a short while. I only use Pass from the commandline now. I prefer working on Ubuntu here. Why waste time on GUIs?