Check that all Hyper-V servers are connected before you begin. 2. Virtual machine replication will be paused and resumed ...

1. Check that all Hyper-V servers are connected before you begin. 
2. Virtual machine replication will be paused and resumed during renewal.
3. Renewal might take a while. Ensure you don't have any recovery operations in progress or planned.
4. If certificate failures occur for new Hyper-V hosts that are added to the Hyper-V site, retry the job 'Add or update host' on the Jobs tab.
5. If the operation fails, retry the Renew Certificate job on the Jobs tab.