Setting Users MFA phone number on the back end

Is there a way to set an Office 365 users mobile device phone number into MFA prior to the user onboarding?

Get-msoluser -UserPrincipalName <userprincipalname> | Select-Object -ExpandProperty StrongAuthenticationUserDetails

ExtensionData          : System.Runtime.Serialization.ExtensionDataObject
AlternativePhoneNumber : +1 12398736545
Email                  :
OldPin                 :
PhoneNumber            : +1 1233258741
Pin                    :

Set the strongauthenticationuserdetails.phonenumber variable perhaps?

$user=Get-MsolUser -UserPrincipalName <UserPrincipalName> | select UserPrincipalName,StrongAuthenticationUserDetails

Set-MsolUser -UserPrincipalName <UserPrincipalName> -StrongAuthenticationUserDetails   ?
Set-MsolUser -UserPrincipalName <UserPrincipalName> -strongauthenticationuserdetails.phonenumber "+1 8001239876"

Thanks in advance.
Christian HansUndecided... Asked:
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Vasil Michev (MVP)Commented:
You cannot do this via the method outlined above, as the property is set to read-only. The only possible workaround currently is to use the mobilephone/alternateemail properties as detailed here:

In the coming months, we should finally have an API that allows us to manage MFA programmatically, but for now the above is your only option.

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