Can't validate my app with meta tag

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Hello, I have tried verify my domain via HTML upload & meta tag insertion, but none of it worked. I kept getting the error: The verification code was not found for domain domain_name .com. Can somebody help me about this issue?

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.