CMMVC8664E The change volume could not be associated because it does not have the same well-defined site as the associated volume in the relationship.
Explanation
Change volumes support HyperSwap® volumes by capturing consistent data during synchronization. This process allows access to the consistent data if the remote site is lost. The change volume must be on the correct site for the volume in the active-active relationship it is being associated with.
User response
Configure the change volume in an I/O group and storage pool on the same site as the volume in the active-active relationship you are associating it with.