o365 mail sniffering feature : relam based site

Hi, i was testing the feature of owa bypass. And when i targeted i got the prompt for username and password, however with correct user name pass also its asked again and again. And also if i try to run the invoke self search command its not working. The domain used in the environment looks like below. Please help me on this.
The actual owa site is like: outlook.office.com/owa/?realm=xxx.com
On browser:
https://outlook.office365.com/EWS/Exchange.asmx/relam=xxx.com ---> This asked for username and password again and again.

I used the below command on mailsniper module:
i tested couple of options with no results.
PS C:> Invoke-SelfSearch -Mailbox aaabbb@domainxxx.com -ExchHostname outloo
k.office365.com Remote

PS C:> Invoke-SelfSearch -Mailbox aaabbb@domainxxx.com -ExchHostname https:
//outlook.office365.com/EWS/Exchange.asmx/relam=xxx.com Remote

Error:
Exception calling "Bind" with "2" argument(s): "The request failed. The remote
server returned an error: (404) Not Found."
At C:\MailSniper.ps1:778 char:73

•     $rootFolder = [Microsoft.Exchange.WebServices.Data.Folder]::Bind <<<<
  

($service,$FolderId)
+ CategoryInfo : NotSpecified: (:) [], MethodInvocationException
+ FullyQualifiedErrorId : DotNetMethodException
Let me know.

Start with Invoke-SelfSearch in MailSniper.ps1 around line 778 and reproduce the reported 404 using the listed ExchHostname and realm-based URLs. Confirm whether the issue is with the supplied Exchange endpoint or the feature's handling of realm-based sites; done would require a defined, working search flow for the reported environment.