I am facing this issue in GBP.
Google My Business API has not been used in project 1093071571203 before or it is disabled. Enable it by visiting https://console.developers.google.com/apis/api/mybusiness.googleapis.com/overview?project=1093071571203 then retry. If you enabled this API recently, wait a few minutes for the action to propagate to our systems and retry.
Hey, please follow the link and make sure Google My Business API is enabled for your project. Then, go to that Google Business Profile credentials in the Credentials page inside n8n and re-connect them (it will popup a new Google login window).
Feel free to mark this as solved if it helped 
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