Hello BlacklistGuy,

“Adding volumes to a volume group

You can add virtual volumes to a new or existing virtual volume group. All volumes in a volume group must be in the same pool. To add a volume to a volume group, the volume must have the same mappings as all other members of the group. This means that the volume must be mapped with the same access and port settings to the same initiators, hosts, or host groups. If the volume group is part of a replication set, you cannot add or remove volumes to or from it. If a volume group is being replicated, the maximum number of volumes that can exist in the group is 16.”

This information is found on page 97 of the Administrator guide.  The error that you are getting is due to the volume that you are trying to add not meeting the requirements for adding a volume.

Here is the link to the administrator guide. https://dell.to/3gl6e9Q