Owncloud starts but does not synch my files anymore

I am writing because OwnCloud on my Mac System (Big Sur 11.7.7) does not synchronize my files anymore, it has been 11 days now. When I start my Mac, Owncloud seems to be logged in, but the cloud Icon has a constant " on it. When I go to it and check “Activity”, nothing appears, and under Synch Protocol I see nothing showing up under “File”. Same if I click under “Recent changes”, I see a grayed text saying “no items synched recently”. Can anyone help me figure out how to synch my files again?

Thank you!