You have a virtual host with VMs, and licenses for Virtual Host workload (such license can be used to back up 1 Hypervisor Host Server and up to an unlimited number of virtual machines that are residing on the Hypervisor Host Server).
When you check the details of host and VMs with applied plans, license assignment is correct.
However, if you look under Settings -> License usage, one or more of Virtual Host licenses are assigned to VMs without Agent, or the licenses are shown as "not assigned".
You are backing up a VM with Active Directory; application-aware backup is enabled. A new dedicated domain administrator account was created on the VM specifically for application backup with Acronis Cyber Protect (see Required user rights).
You have a Virtual Appliance and see a new update for it available under Settings -> Agents. You click Update, but there is no sign of VA being updated. Under Activities, you can see that the update task is in the Pending state.
You try to apply protection plan to a virtual machine
When you select a VM and click on "Protect" you see the message: Applying protection or VM replication plans to virtual machines is not possible on the parent unit level. Switch to the corresponding child unit where the protection agent is registered