SCOM Managment server grayed out after removing from All Management Servers resource pool

• This occurs because the run-as data warehouse accounts are configured by default to  distribute to the All Management Servers resource pool only.  

• When the management server is removed from the All Management Servers resource pool the data warehouse account is no longer distributed to it, therefore any workflows requiring this account will fail and unload. The failing and unloading of the workflows will cause the management server to become grayed out.

• To resolve this issue, go to the “Data Warehouse Account” and “Data Warehouse Report Deployment Account” profiles and determine which account(s) you are using. Then, go to those accounts under Run As Configuration and change their deployment type to either “less secure”, to the specific management servers, or to the new resource pool that the management servers belong to.