Outlook Addin in 25R2 - Register an Instance with Microsoft Entra

Hi ​@brucewarrell96  Thanks for reaching out.  As ​@nickcerri32  suggests, please open a case with support so that they can connect and answer appropriate to your specific instance.  

Best,

Tara

Adding a note here as I came across this while researching something else.
MYOB Customers all have a similar situation with the domain verification.

MYOB’s client specific instructions are here:
https://help.myob.com.au/advanced/Docs/Published/UserGuide/US__how_AzureAD_Registering_with_Azure.html

The relevant part is this note, which I believe is probably cross transferable to SaaS Acumatica customers:
 

In the Edit application ID URI dialog box, confirm the suggested URI of your MYOB Acumatica URI.
We suggest accepting the system-generated value in the api://<Application_Client_ID> format.

Attention: For single-tenant applications, Microsoft Entra ID validates that the domain in the URI is in the verified domain list in the Entra ID tenant. If the specified domain is not verified, you should use the default scheme (api://<Application_Client_ID>) suggested by Microsoft Entra ID.

Ok, sorry ​@brucewarrell96  /anyone else reading this
The above is wrong, the difference that generates the above warnings is the difference between:
Https://
And
api://

use of Https:// will generate the above error

If you use api:// then you won’t get an error.
 

Correct Format:

api://myobsupport-sso-demo.myobadvanced.com/f001cd16-a5ba-418c-8a1a-ecceb0c87cc0
 

Incorrect Format:
https://myobsupport-sso-demo.myobadvanced.com/f001cd16-a5ba-418c-8a1a-ecceb0c87cc0

Bit of an opaque error,

The problem is the https:// at the start.  Using api:// will work fine.