XFS Filesystem has duplicate UUID problem Administration
If you can not mount your XFS partition with classical wrong fs type, bad superblock etc. error and you see a message in kernel logs (dmesg) like that:

XFS: Filesystem sdb7 has duplicate UUID – can’t mount
you can still mount the filesystem with nouuid options as below:

mount -o nouuid /dev/sdb7 disk-7

But every mount, you have to provide nouuid option. So, for exact solution you have to generate a new UUID for this partition with xfs_admin utility:
xfs_admin -U generate /dev/sdb7

Clearing log and setting UUID
writing all SBs
new UUID = 01fbb5f2-1ee0-4cce-94fc-024efb3cd3a4

after that, you can mount this XFS partition regularly.

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