This behavior coincides with the true desktop brother current versions, but there is at least one error message that is not effective, but at least identifies a normal behavior. Special joke: the password is extracted and stored [and what else?] Before the 2x decides that it can establish no connection; to an error in the authentication method it can probably not lie when specially pre warned about the uncertainty of connection method.
In any case there is no indication to what RDP or TS versions of 2X Client is compatible, and which do not (more).