If you log into multiple user accounts in USD, occasionally you may need to clear out a cached user, there is a workaround for this.
The workaround is to clear the localStorage by:
1. Open USD
2. Right click on the agent widget and go to Inspect
3. Type localStorage into your console
This should show an output like below, potentially with a large amount of data.
4. Type localStorage.clear(); into your console, and type localStorage again afterwards to ensure it's been cleared.
5. Retest USD and it should ask you to log into the agent widget.