wipe disk button missing

I have some previously used in another project disks I wish to use with proxmox backup server but I can't figure out how to wipe the disks to be able to setup a datastore.

I'm in the admin > Storage/Disks tab and I don't see a wipe disk button.

I looked at the storage help article
https://pbs.proxmox.com/docs/storage.html
when I try to run the initialize command I get an error that the disk is already in use.

how can I wipe the disks to be able to create a new datastore?
 

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