Unable to add DAG member server in exchange 2019

 https://learn.microsoft.com/en-us/answers/questions/88811/unable-to-add-dag-member-server-in-exchange-2019

http://learn.microsoft.com/en-us/answers/questions/500000/adding-members-to-dag-a-server-side-database-avail

https://learn.microsoft.com/en-us/answers/questions/500000/adding-members-to-dag-a-server-side-database-avail

https://www.alitajran.com/cannot-add-dag-member-server/