What should I do if I receive errors related to using multiple Google accounts?
You may receive one of the following error messages while using the Mail Merge add-on:
"Authorization is required to perform that action."
“A server error has occurred. Please wait a bit and try again.”
These errors occur when two or more Google accounts share the same web browser.
For example, Tom may check his personal Gmail (email@example.com) on one browser tab and then access his work Google Drive (firstname.lastname@example.org) on another tab. When Tom later comes to do a mail merge, he may receive one of the errors above.
This is a documented Google bug.
The Temporary Workaround
Load your browser in Incognito/InPrivate mode by pressing Ctrl+Shift+N.
Login only with your licensed Google account and run the add-on as normal.
The Permanent Solution
In Google Chrome, create a profile for each Google account. Each user account can then have its own profile to access its Google account, rather than using a single shared profile to do so.
In our example, Tom would have a Chrome profile where he would access all of his personal (email@example.com) Google services. Likewise, he would have a Chrome profile where he would access all of his work (firstname.lastname@example.org) Google services (see screenshot below). The error would be avoided as Tom would not use multiple Google accounts on the same profile.