This error occurs when a connector is created for a Google Ads MCC account. It is not possible to pull data from an MCC account, resulting in the following error:
Error: It is not supported to request Connectors data from an MCC account. Please select a single account and try again.
You can read more about Google Ads manager accounts in this Google documentation.
How to resolve this error
To resolve this error, either delete the connector configuration or change the Google Ads account.
If you encounter any further issues or need additional assistance, please don't hesitate to reach out to the Alvie support team.