Unable to submit App due to domain_not_verified alert

I’ve tried to submit my app, and already verified by uploading html file. but when i tried to submit it come alert domain_not_verified, and another issue is when i log out then log in again, the button for domain verification show again as before doing verification.

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.