Yes, correct token and auth.
I had to delete the storage on the PBS which (after a PVE update) was causing trouble.
I have manually deleted the storage and mount point and was able to get rid of the error message.
Please make sure that storage can be deleted via PVE GUI. I can add a PBS there but not remove it.
Took me a while to find out how I can do it and is for people not using the linux shell often a real pain in the ass