Unable to send an invite from vcenter to Avamar server.
Can installing an avamar client for windows on vcenter and registering it with Avamar server will help?
A little more details will be helpful.
Are you trying to protect vCenter infrastructure by installing an avamar client?? Else i dont see why you would need to invite the vCenter to avamar server.
Also i would check your Avamar to vCenter connections, looks like maybe they are not running/stopped.