MEMSOURCE Plugin for Studio 2019 - Unable to connect to remote server error

Hello,

I am running into an issue with using the Memsource Plugin for Studio 2019 

Following the instructions listed on the Memsource wiki page, I get an error, "Unable to connect to the remote server", as shown above when I try to authenticate my account (add username/password and click "Login"). I am using Trados Studio 2019 and the SDL plugin installed was for Studio 2019.

Any insight on how I can get this to work? Thank you.