The issue has been successfully resolved.

Failed request due to failure in validating the Bing Ads API SSL certificate should now be retried automatically and should not cause the sync to fail.

If your most recent sync failed, we expect the next sync to succeed, but you may still experience some transient errors due to Bing Ads’ API occasionally issuing invalid certificates.

Thank you again for your patience as worked this issue to resolution and we apologize for any inconvenience this issue might have caused.

The team has identified that this is due to a certificate error when communicating with the Bing Ads API. We are currently working on a fix for this incident.