Google Cloud → APIs & Services → Credentials → your Web client → Authorized redirect URIs
This is not the same URL as Search Console / Analytics OAuth. You must add /api/google-ads/oauth/callback separately.
https://aigeo.ae/api/google-ads/oauth/callback
Optional: set GOOGLE_ADS_REDIRECT_URI or GOOGLE_ADS_OAUTH_REDIRECT_URI in server .env to one exact URL if your proxy host does not match what users type in the browser.