Running ArcGIS Enterprise 10.91. I have a Postgres enterprise geodatabase connection, connected as the SDE user. In ArcGIS Pro I can create, update, and delete tables using this connection. I am attempting to register this with our ArcGIS Server so we can publish services.
Attempts to register this data store through ArcGIS Server Manager returns the following error: The connection property set was missing a required property or the property value was unrecognized. Bad login user[ ]

I would assume the username and password are correct since I can use this connection file in ArcGIS Pro. Any ideas?