Let's assume you want to change ownership of volume from Tenant_A to Tenant_B.
Step 1: Tenant A will initiate an Ownership Transfer which will enable another tenant to take ownership of it.
$ source openrc Tenant_A Tenant_A $ cinder transfer-create [volume_id]
An Authentication Key and a Transfer ID are returned here.
Step 2: Tenant B needs to accept the Transfer using the Transfer ID and The Authentication Key generated above.
$ source openrc Tenant_B Tenant_B $ cinder transfer-accept [transfer_id] [auth_key]
You should now see that volume associated with Tenant_B