Verify sub Domains error

I want to publish the zoom amrket placede app. Verify that your domain name is in place. I actually have a sub domain. Add a tag to your domain page, I selected Domain Verification failed. Can you help me when I get an error?

Hello,

Thank you for reaching out in relation to Our Domain Validation process, the next steps will be sent to you via DM. Please refer to our domain validation resource: Domain Validation Explanation for any further questions you may have about the process.

Thank you.