Please see Install an App from the App Marketplace for detailed step-by-step instructions on installing embedded Apps in Procore. If you are still experiencing problems, please contact support for assistance.
Whoever created the App configuration may have inputted an invalid Google Sheet URL (typo, etc.) in the. Check to make sure the configuration has the correct information.
It is possible you may not have access to the google sheet that’s being displayed. You should request access from the Google Sheet's owner.