After upgrading to a new version of VMM, you will need to reassociate the Hyper-V hosts. This recipe will guide you through the steps required to do so.
To reassociate hosts and library servers, carry out the following steps after upgrading VMM:
If a host needs to be reassociated, the Host Status column will display Needs Attention and the Agent Status column will display Access Denied.
Select the host(s) to reassociate (use the Shift or the Ctrl key if you need to select multiple hosts), then right-click on the host(s) and click ...