This post was split from the topic: "Access denied" error while using lexoffice
I am encountering a similar error with lexoffice. I can connect to lexoffice and upon testing the connection I even get a success message. However, the file is simply not being transmitted to lexoffice and the first few times I received a Zap alert saying “The app returned "invalid_grant".”
The odd thing is that it works perfectly fine with another lexoffice account that I have. The file is there immediately. But with my other account the exact same setup does not work.