Symptoms:
The administrator has three SRM servers paired with the production vCenter. The administrator has successfully paired one of them with a DR vCenter and SRM server; however, the administrator has been unable to pair the other two SRM servers with their respective DR vCenters and SRM servers.
Live Site Recovery (all versions)
If there is a requirement for a shared recovery site, where one vCenter instance needs to be paired with multiple other sites, a separate SRM appliance must be deployed for each pairing. Each of these appliances must be registered with a unique custom extension ID to enable multiple pairings on the same vCenter Server.
Please refer to the documents to configure a shared recovery site Configure Multiple Site Recovery Manager Server Instances on a Shared Recovery Site
Connect the Site Recovery Manager Sites in a Shared Recovery Site Configuration