Thanks for posting 
Sorry that is happening, here are some detailed steps to try:
- The correct form for this is : Developer Support Ticket (You will need to sign in under your Zoom Developer Account)
- Some of the form needs your specific details but I included what you should chose for some of the fields.
- Request Type:
- Technical Support
- CC: integration.testers@zoom.us (optional)
- Subject:
- Need assistance with Manual Domain Validation
- Description:
- include the app name(s) and development client ID(s) for the apps they are requesting manual validation for. They should also briefly request help with the manual validation next steps.
- Product:
- Developer
- Developer App Type:
- Issue Type:
- App Submission
- About:
- Domain Validation
- API Endpoints and/or Webhooks:
- the endpoint URL(s) not validating when included in the submission metadata
Please let me know here if that get’s you unblocked or not! 
Thanks for developing with Zoom!