Besides, you may flush health service state and cache.
You may also refer to following post for troubleshoot grey agent
https://learn.microsoft.com/en-us/system-center/scom/manage-agents-not-healthy?view=sc-om-2019
Roger
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SCOM 2019 management servers are greyed out however we are able to monitor other servers.
We have an agent deployed on the management servers.
What can we do to monitor the managment servers (green)?
Besides, you may flush health service state and cache.
You may also refer to following post for troubleshoot grey agent
https://learn.microsoft.com/en-us/system-center/scom/manage-agents-not-healthy?view=sc-om-2019
Roger
@David Kim ,How's everything going? Was our issue resolved? Would you mind to provide the required information to go further? If there's anything unclear, feel free to let us know.