Hi @Help3 , when validation fails, it usually means the app didn’t return the JSON response in the exact format Zoom expects so the production secret token may be the culprit if it was changed. You said “No significant changes were made to the webhook validation logic,” so I want to confirm what if any changes were made.
Other things to check:
- WAFs or specialized server firewalls may have recently updated security rules, causing them to block Zoom’s validation user-agent or IP ranges see example from another poster: Validation fails even though response is correct - #4 by iSkeat
- Zoom requires valid HTTPS endpoints. Check if your production SSL certificate has expired, has an incomplete certificate chain, or dropped support for TLS 1.2+.
Not to my knowledge after reviewing internally and checking the Zoom Status “past incidents” section at the bottom, however can you see this section from our documentation on revalidation and review if it applies to you? In particular, check for email notifications and let me know when they were delivered to your inbox.
I can submit through our service engineering team after you check the above suggestions and we rule them out 