New Domain not showing in Accepted Domains

Hi @Jabulani Motloung,

Thank you for
There are a few reasons yhy a newly added domain is Healthy but missing from Accepted domains:

1. Backend replication delay

When a domain is added, it’s registered in Microsoft Entra ID first and then replicated to Exchange Online. In some cases, this replication is delayed or gets stuck. As a result, the domain appears Healthy under Settings > Domains, but Exchange Online never provisions it as an Accepted Domain.

2. Exchange service not enabled

If Exchange Online was not selected (or the selection didn’t persist) during domain setup, the domain will not appear under Accepted domains even if DNS shows as healthy.

3. Domain previously used in another tenant

If the domain was recently removed from another Microsoft 365 tenant or migrated between tenants, Exchange Online may fail to provision it due to leftover backend associations. In these cases, Microsoft Support usually needs to run a backend resync.

4. Accepted domain exists but not visible in EAC

Sometimes the domain is already provisioned in Exchange Online but does not appear in the Exchange Admin Center UI. This can be verified using Exchange Online PowerShell.

First of all, since short delays are expected, you can wait for replication. If it still doesn’t appear after a reasonable wait, continue the following steps:

1. Verify Exchange is enabled for the domain
   • Microsoft 365 admin center > Settings > Domains
   • Open the domain > check that Exchange is selected
2. Check via PowerShell

To view summary information about all accepted domains, run the following command:

Get-AcceptedDomain

To view details about a specific accepted domain, use the following syntax.

Get-AcceptedDomain -Identity <Name> | Format-List

More information at: Manage accepted domains in Exchange Online | Microsoft Learn

If the domain is healthy but still missing in Accepted domains after you've done all the verification steps, please create a support ticket via Microsoft 365 Admin Center. Microsoft also provides customer service phone numbers based on your region. You can find the appropriate contact number here: Customer service phone numbers - Microsoft Support 

Microsoft Support can force a backend synchronization, allowing a support engineer to investigate the tenant at the system level. This includes reviewing backend configurations, running advanced diagnostics, and escalating the case to specialized teams with access to internal systems and logs, which are required to resolve issues not visible in the admin portals.

As community moderators, we’re here to guide you, but due to privacy and security limitations, we don’t have access to the backend tools required for a full resolution. For this reason, contacting Microsoft Support via the Admin Center is the most secure and efficient way forward.

I hope this helps you resolve the issue quickly. I’m glad to assist and truly hope the information provided has been useful. Please feel free to reach out anytime if you need further assistance.  

If you find my post helpful, kindly consider marking it as the accepted answer. Doing so can assist others in the community who may have similar questions in finding solutions more quickly.  

Thank you for your kindness and contributions to the forum.

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In Microsoft 365, a domain can be fully added and show as healthy in the Microsoft 365 admin center but still not appear as an accepted domain in Exchange Online if it has not yet been configured there as an accepted domain.

For Exchange Online mail flow, the domain must exist as an accepted domain in Exchange (EAC/PowerShell). If it is missing, scenarios such as hybrid configuration or mail routing will fail with errors like “Hybrid domain <domain> isn't an accepted domain for the cloud organization” or “No Accepted Domains found on tenant.”

To resolve this:

1. Confirm the domain is added and verified in Microsoft 365 (admin center → Settings → Domains) and shows healthy.
2. In Exchange Online, add or configure it as an accepted domain:
   • Go to Exchange admin center → Mail flow → Accepted domains.
   • If the domain is not listed, add it as a new accepted domain and choose the appropriate domain type (Authoritative or Internal relay) as described in the accepted domain configuration guidance.
   • If it is listed but misconfigured, edit it and set the correct domain type.
3. If using hybrid, rerun the Hybrid Configuration Wizard only after the domain exists as an accepted domain both on-premises and in Exchange Online, otherwise HCW will report that the hybrid/coexistence domain is not an accepted domain.

If the domain was just added, allow some time for replication; Exchange Online may not immediately reflect the new accepted domain configuration.

References:

• Manage accepted domains in Exchange Online
• HCW8004, HCW8009, HCW8016, HCW8017, HCW8029, or HCW8030 error when running the HCW
• Hybrid domain isn't an accepted domain for the cloud organization error when you run the Hybrid Configuration wizard
• Configure an accepted domain within your Exchange organization as authoritative
• Email messages aren't received for a new domain that you add in the Microsoft 365 portal
• Find and fix issues after adding your domain or DNS records