Tried digidoc on Fedora 34 Cinnamon. It installed as the part of open-eid from their standard repo. The internal SC reader works out of the box.
The kernel Fedora runs on is 5.11.12-300.fc34.x86_64. I don’t know if it is of any help.
Replying to what you wrote:
I built it either with yay or via the Pamac GUI. cannot run qdigidoc via terminal. It is the national ID management and and creation of signed containers.