Known Bugs And Issues For Addons
Help is the only choice in the add-on menu
Sometimes, while attempting to launch the add-on, the only choice in the drop-down menu is Help. Internal Google issues are usually the reason for this.
If other options don’t appear, try reloading the spreadsheet a few times.
The first time you try to install the add-on, it fails
The add-ons in Google Workspace Marketplace are all affected by this issue, which is a known Google issue.
Try installing the add-on again a few times to see if the problem goes away