@Selva saravana kumar Since the Microsoft Q&A community has a policy that the question author cannot accept their own answer. They can only accept answers by others, I' have summarized and posted the solution/answer to benefit the community users to find the answers quickly.
Issue: Domain verification failed
Solution: Vetting team verified the documents provided and verified the domain.
Source link: https://learn.microsoft.com/en-us/microsoft-for-startups/get-more-benefits-faq#how-do-i-verify-my-domain
If the response helped, do "Accept Answer" and up-vote it