Trying to add "external organization" to outside senders

Hi! Thanks for your time, I’m sorry if this is in the wrong place and I’m being a bit thick, but I’m new. I am following this link regarding but PowerShell gives me this warning below. Any ideas? I’ve only got the one admin account.

New-ExoPSSession : Admin account chosen for authentication is different from the one provided as parameter during
Connect-ExchangeOnline. Please choose the same account during authentication as well.
At C:\Program Files\WindowsPowerShell\Modules\ExchangeOnlineManagement\2.0.5\netFramework\ExchangeOnlineManagement.psm1:475 char:30

  • … PSSession = New-ExoPSSession -ExchangeEnvironmentName $ExchangeEnviro …
  •             ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
    • CategoryInfo : NotSpecified: (:slight_smile: [New-ExoPSSession], Exception
    • FullyQualifiedErrorId : System.Exception,Microsoft.Exchange.Management.ExoPowershellSnapin.NewExoPSSession