Problem adding NFS4 storage

I cannot add a NFS4 storage via Datacenter->Storage->Add->NFS. I always get "create storage failed: storage 'nfsshare' is not online (500)".

I also tried adding the NFS4 storage manually to /etc/pve/storage.cfg:

nfs: nfsshare
export /nfsonceph
path /mnt/pve/nfsshare
server g1.net.innostus.com
content images,rootdir
options vers=4.1,proto=tcp

This results also in "storage 'nfsshare' is not online (500)"

However when I manually...

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