Impossible to remove remote desktop license server
Solution 1:
I had the same error. Login with the SQL-Manager Server to the localhost.
\\.\pipe\MICROSOFT##WID\tsql\query
TSQL> To remove the orphaned Server with the ID 1005.
use RDCms
delete from rds.RoleRdsh where ServerId = ‘1005’
Dave Harris wrote a excelent blog to this issue.
https://dave.harris.uno/unable-to-remove-deleted-session-hosts-from-rds2012-deployment/