Error loading report

Hi, I am getting this error when trying to open the settings for the plugin:

“There was an error loading report. Unable to retrieve report data: User doesn’t have permission to access customer. Note: If you’re accessing a client customer, the manager’s customer id must be set in the ‘login-customer-id’ header. See https://developers.google.com/google-ads/api/docs/concepts/call-structure#cid”

Plugin was earlier connected to another source which is now deleted. How can I “reset” the plugin so that I can install it to another source? Deleting and installing the plugin again does not do the trick.