Grant Permission with Google – 401 error

  • Having spent the better part of an hour setting up my Google API access and Client ID etc. the plugin will not allow me to grant permission with Google.

    Clicking on the Grant Permission with Google link consistently gives the following error:

    401. That’s an error.
    Error: invalid_client
    The OAuth client was not found.

    Request Details

    response_type=code
    redirect_uri=https://www.mydomain.com/wp-admin/options-general.php?page=postman
    client_id=https://www.mydomain.com/wp-admin/options-general.php?page=postman
    scope=https://mail.google.com/
    access_type=offline
    approval_prompt=force
    state=5c5fee53defbbdaa6d474801595f9904
    [email protected]

    That’s all we know.

    The current status message on the plugin says
    “Postman is not configured and is mimicking out-of-the-box WordPress email delivery.”

    It would seem we are just one step away from finally getting this plugin working. Can you please help?

    Much appreciated.

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