MigrationToTeamsDNSCheck-V1.7.ps1 - Can list incorrect default domain

[SvenBell]

MigrationToTeamsDNSCheck-V1.7.ps1 - Can list incorrect default domain or two default domains. As .onmicrosoft.com is not always default domain even if it was initially, as you can switch this to what you prefer.
i.e. script is listing the both xxxx.mail.onmicrosoft,com and xxxx.onmicrosoft.com as the default domain when it is the xxxx.onmicrosoft.com that is the default domain. Get-CsOnlineSipDomain likely can't determine the default domain, would need to use Graph API or AzureAD module command Get-AzureADDomain command with .IsDefault property.