The pcloud.com webdav access is not working really good. It sometimes produces errors or stops syncing. The only way is to disconnect and reconnect the webdav (in my case the europe link ewebdav).
I had this same issue with Cryptomator. But after they supported pcloud.com api everything worked fine. It would also be possible to use 2fa which I cannot at the moment, as webdav does not support that.
So can you please check if you could extend the cloud services and add pcloud.com? Would appreciate that
API Link: https://docs.pcloud.com/