When we go to the Google sheets drop down for Supermetrics and click the option "Launch", in the bottom of the page appear "Working" but the sidebar doesn´t appear. This is happening across all of our sheets.
"Google is suffering from issues with all Sheets Add-ons, which causes Supermetrics for Google Sheets not to launch.
We've contacted Google, and got feedback that they're working on fixing the issue.
Please star this issue on Google's Issue Tracker, to make sure they note the problem is widely spread and prioritize fixing.
Very sorry for the inconvenience. We'll update the situation here when services are restored."