I have updated exact steps provided in my app for submission.
Previous it was working, after adding new scope and changing description, now i am not able to validation my domain. Previously i have submitted same app for few times for review.
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.