message code: 715-456280

Question

event ID: [Moderator note: Personal information removed]

Please help me add my domain.

Answer 1

Hello @Amel Perez, 

Good day! I hope you are doing well. 

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Based on my research, the error 715‑456280 appears when Microsoft 365 can’t process the domain verification record on their side, even if your DNS TXT record is correct and already propagated. This issue may require Microsoft Support to review the backend logs.  

Before contacting support, please double‑check the following just to rule out common DNS formatting issues: 

• Make sure the TXT value is entered exactly as provided, with no extra characters. 
• Confirm that your DNS host field uses either @ or the full domain name (this varies by provider). 
• Use an external DNS lookup tool to verify the MS= TXT record is publicly visible.  

If everything looks correct and the error continues, the next step is to open a support ticket in the Microsoft 365 Admin Center: Get support - Microsoft 365 admin | Microsoft Learn   

When you submit the ticket, include: 

• The reference code 715‑456280 
• The Event ID from your error message 
• A screenshot of your TXT record 
• DNS lookup results 

This information helps Microsoft quickly locate the issue in their system and resolve it. 

Please let me know if you have any trouble contacting Microsoft Support Team. I'm here and happy to help!

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Answer 2

Follow these steps to add a custom domain to Microsoft 365/Entra ID:

1. Sign in as an admin
   • Go to the Microsoft Entra admin center: https://entra.microsoft.com
   • Sign in with an account that has at least the Domain Name Administrator role.
2. Add the domain in Entra ID
   • In the left navigation, go to Entra ID > Domain names.
   • Select Add custom domain.
   • In Custom domain name, enter the domain (for example, contoso.com) including the top-level extension (.com, .net, etc.).
   • Select Add domain.
3. Get the DNS verification record
   • After adding, the domain will show as unverified.
   • The domain page will display the required DNS record (TXT or MX) to prove ownership.
   • Copy and save this DNS information.
4. Add the DNS record at the domain’s DNS host
   • Go to the DNS hosting provider for the domain (this may be your registrar or another DNS host).
   • Add the TXT (or MX) record exactly as shown in the Entra ID portal.
   • Wait for DNS propagation (can take up to several hours depending on the provider).
5. Complete verification
   • Return to Entra ID > Domain names.
   • Select the domain and choose to verify it (the portal will re-check DNS).
   • Once the TXT/MX record is visible publicly, the domain status changes to verified.
6. If the domain cannot be added
   • If an error indicates too many unverified domains, either:
     • Verify some existing unverified domains, or
     • Delete unneeded unverified domains.
     • There is a limit of 100 unverified domains per tenant.
   • If an error says the domain is already registered, it already exists in a Microsoft 365/Azure subscription and cannot be added again.
7. If an HTTP 500 error appears when adding the domain
   • This can occur if trying to use a protected DNS suffix that is reserved for Microsoft.
   • In that case, contact a Microsoft representative for assistance.

After the domain is verified, continue in the Microsoft 365 admin center to add the required DNS records for services (Exchange Online, Teams, etc.) as guided by the setup wizard.

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References:

• Add your custom domain name to your tenant
• An administrator can't add a domain to Microsoft 365, Azure, or Intune
• Add a custom domain to Microsoft 365