If you logged in to the CAPI Gateway admin and saw 404 status or message "Something went wrong," you might need to install updates. Go to Conversions API Gateway and Solutions Installer and check for the updates. Install those if available. You need to wait up to 30 minutes to check if updates helped fix CAPIG.
2. CAPIG instance URL shows an error.
After you've set a DNS record for the CAPIG URL, it might take up to 30 minutes to set up your CAPIG instance.