Gmail OAuth Error 400: redirect_uri_mismatch

  • scratchmommy

    (@scratchmommy)


    1 day, 16 hours ago

    I’m using WP Mail SMTP 4.9.0 with the Google/Gmail mailer and manual OAuth setup. Reauthorization fails with Google Error 400: redirect_uri_mismatch.

    My Google OAuth client is a Web Application, is enabled and in Production, and its Authorized Redirect URI is exactly:

    https://connect.wpmailsmtp.com/google/

    That same URI appears in WP Mail SMTP.

    The Client ID configured in WP Mail SMTP matches the OAuth client in my Google Cloud project.

    However, Google’s OAuth error page after authorization shows a different Client ID, beginning with 59408480254-....

    Can you confirm whether that second Client ID belongs to the WP Mail SMTP connect.wpmailsmtp.com intermediary, and why Google is reporting a redirect URI mismatch when my configured redirect URI matches exactly?

    The page I need help with: [log in to see the link]

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