@OzDownUnder Thank you for reaching out to us, As I understand you want to know the email address of the user while connecting to PowerShell via Connect-AzureAD.
Researched on this and found this cmdlet which can provide the email address of the current session (connect-azuread) who logged in
Get-AzureADUser -ObjectId (Get-AzureADCurrentSessionInfo).Account.Id | select mail
Let me know if you have any further questions, feel free to post back.
(Get-AzureADUser -ObjectId (Get-AzureADCurrentSessionInfo).Account.Id)