When I provision Ubuntu Instance (Morpheus image) 22.04 in vCenter, it stuck in the network waiting stage.
I tried both agent and without agent installation. The issue is still the same. No issue with the CentOS instance.
I had a similar problem. I was able to solve it by adding a search domain (Edit desired network → Advanced options → Add search domains, the domain in which the Morpheus appliance is also connected.
Another way is to edit the setting of Cloud: Appliance URL to IP address instead of FQDN (just for testing purposes).