I appreciate your feedback!
These options are already configured :/
Verify there is a name in the VM Network Servers form, and that it is the same name as in the Network Elements form.
Also verify you have a hostname defined in System IP Properties.
If the PBX is named "local_68" or "MSP_vMCD" in the Network Elements form, it needs to be the same in the name field of the local element in the VM Network Servers form, also tick Local (and cluster if applicable).
If all that fails, assuming that all the logs are related to MB5555, delete mailbox 5555 and recreate it.