Force mount of database copy with failed state
Some time you need to forcefully move and activate the passive database in a DAG environment . You can do it with all the “skip..” checks :
Move-ActiveMailboxDatabase -Identity "Database_Name" -ActivateOnServer "New_Server_Name" -MountDialOverride "BestAvailability" -SkipActiveCopyChecks -SkipClientExperienceChecks -SkipHealthChecks