Error when changing a domain from Authoritative to Internal Relay

Question

I need to change a domain name from Authoritative to Internal relay so a catch-all can be set up.
When I make the change and save it, i'm getting a "Failed to update the accepted domain" error, along with "Error executing cmdlet" which doesn't give me much to go on. Google didn't really help either.
Any pointers on where to look would be great. There's two domains currently, one that is default. The default one is the one needing to change, but i've tried the other just in case, same error

Answer 1

Have you tried with Exchange Powershell?

Answer 2

Hi @Dave Wakelin ,

Welcome to our forum.

Have you successfully changed the accepted domain type?
If you need to change the type of accepted domain, you could use the EAC or Exchange PowerShell:

1.EAC:

• Navigate to Mail flow > Accepted domains. The Accepted domains screen appears.
• Select an accepted domain and click it. The accepted domain's details screen appears.
• Under the This accepted domain is section, select the Internal relay

2.Exchange PowerShell：

Set-AcceptedDomain -Identity <Name> -DomainType InternalRelay  

For more details, please refer to manage-accepted-domains

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Answer 3

Ahh, for some reason I didnt think about powershell, worked like a treat - thank you very much

Answer 4

Related: I just hit the same symptoms going the other direction (changing some domains from Internal relay to Authoritative, via Exchange admin center).
This likewise worked fine via PowerShell.

Answer 5

FYI, this is happening for me in EAC today—is this not yet fixed?

I get the same "Failed to update the accepted domain" error when I try to change the default domain from Authoritative to Internal Relay.