If you clone a volume with xfs filesystem on it and you try to mount this on the same node, than normally you will receive error messages, like wrong fs type, bas superblock,… you have the problem with xfs filesystem duplicate UUID.
In the dmesg you should file a message like:
XFS: Filesystem sdb1 has duplicate UUID - can't mount.
If its a one time mount you can do it with:
sudo mount -o nouuid /dev/sdb1 /mnt
But the better solution is to generate a new uuid for the filesystem, because its clean and you can mount it easy without problems:
sudo xfs_admin -U generate /dev/sdb1 Clearing log and setting UUID writing all SBs new UUID = 01fbb4f2-1ers0-4dde-94fc-024efb3cd2a4 after that, you can mount this XFS partition regularly.
Then mount the volume normally with mount:
sudo mount /dev/sdb1 /mnt