We've added a fix in our latest update of TheBrain 10.0.34 (now available on the Alpha channel) that will display a user's email address in the context menu when you right click.
The Alpha channel contains frequent updates and provides access to the very latest versions. It is the recommended channel if you have an urgent need for a fix that is not yet available on the Stable channel and do not mind frequent updates.
To get on the Alpha channel:
Windows: Go to Options > Preferences > System > Updates, and select Alpha from the dropdown menu. Then go to Help > Check for Update, and install the update.
macOS: Go to TheBrain > Preferences > System > Updates and select Alpha from the dropdown menu. Then go to TheBrain > Check for Update, and install the update.