we have very similar issue, SRM broken for entire organisation. We downgraded SRM to our last version from a backup (8.5) and got the same initiator errors.
"Failed to promote replica devices. Failed to promote replica consistency group '*****'. Skipping failover operation for device group '******' as initiators were missing for one or more hosts."
Whats weird is initial failover worked fine, run a failback and thats when we got above error. Thats how its been since.
Have a case running with vmware now who just seem to blame storage from SRM logs, but no changes have happened storage side to cause this.
