Announcing Hybrid Modern Authentication for Exchange On-Premises

Hello GautamKrisna, you can find a list of SPNs at the beginning of this article.

Regarding the edit of the SPNs, you could export what you have currently into an array, then edit it.

E.g. [System.Collections.ArrayList]$SPNs=Get-MsolServicePrincipal -AppPrincipalId 00000002-0000-0ff1-ce00-000000000000 | select -ExpandProperty ServicePrincipalNames

$SPNs.Remove("*smblr.com*")

$SPNs.Add("00000002-0000-0ff1-ce00-000000000000/outlook.office365.com")

$SPNs.Add("00000002-0000-0ff1-ce00-000000000000/*.outlook.com")

..

$SPNs.Add(https://mail.yourdomain.com/") and any other URLs you use for the internal and external MAPI/HTTP, EWS, OAB and AutoDiscover.

We’re looking for https://namespace entries for all the URL’s, not 00000002-0000-0ff1-ce00-000000000000/namespace entries.

When you are good with the SPN list, you can set it into the Service: Set-MSOLServicePrincipal -AppPrincipalId 00000002-0000-0ff1-ce00-000000000000 -ServicePrincipalNames $SPNs

I hope this helps,

Gabriel