How can I resolve Error 400: invalid_scope when setting up Gmail OAuth2 on n8n Cloud?

I'm encountering an Error 400: invalid_scope error while trying to connect Gmail with my n8n Cloud instance via OAuth2. I'm new to n8n and recently set up a workflow to sort nearly 10000 unread emails.

Below are the details of my configuration:

• My n8n instance is hosted on the cloud: https://*************.app.n8n.cloud

• The Google app is in Test mode, and my email is added as a test user

• Scopes used are:

  https://www.googleapis.com/auth/gmail.readonly
  https://www.googleapis.com/auth/gmail.modify
  https://www.googleapis.com/auth/gmail.labels
  https://www.googleapis.com/auth/gmail.send
  

• The redirect URI is set as: https://***************.app.n8n.cloud/rest/oauth2-credential/callback

I have verified that:

• The scopes are correctly listed in the OAuth consent screen configuration
• The Gmail API is enabled in the Google Cloud Console
• My email is added as a test user

Despite these settings, I continue to receive the invalid_scope error during Gmail authorization. What steps can I take to resolve this issue?