Yet I have
Now you have. At least, now you finally posted a log made after you clicked Reload Simbrief, the previous log, as I've said, was like made before clicking it, or after a restart.
Checking the log, is clear what your error is: you inserted your User ID instead of your Username/Alias. Quoting the manual, in all places where it explains what you are supposed to insert as your username.
Page 32, the chapter in the GSX Settings:
The username you must type here is what is referenced in the SimBrief Account as the ALIAS.
Page 80, the chapter about Simbrief integration:
To configure it, just add your SimBrief “Alias” in the GSX Settings page. The Alias can be found by selecting the “My Account” section of the SimBrief website.[/size
And even if you never read the manual, when you hover with the mouse on the username field in the Settings, a TOOLTIP will say this:
Insert your SimBrief "Alias (Username)" here. Not to be confused with the "Pilot ID", which is numeric, and it's not the one you need to use here