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
$user.strongauthenticationuserdetails.phonenumber

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



Thanks in advance.
Christian HansAsked:
Who is Participating?
I wear a lot of hats...

"The solutions and answers provided on Experts Exchange have been extremely helpful to me over the last few years. I wear a lot of hats - Developer, Database Administrator, Help Desk, etc., so I know a lot of things but not a lot about one thing. Experts Exchange gives me answers from people who do know a lot about one thing, in a easy to use platform." -Todd S.

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: https://docs.microsoft.com/en-us/azure/active-directory/authentication/howto-sspr-authenticationdata

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.
1

Experts Exchange Solution brought to you by

Your issues matter to us.

Facing a tech roadblock? Get the help and guidance you need from experienced professionals who care. Ask your question anytime, anywhere, with no hassle.

Start your 7-day free trial
It's more than this solution.Get answers and train to solve all your tech problems - anytime, anywhere.Try it for free Edge Out The Competitionfor your dream job with proven skills and certifications.Get started today Stand Outas the employee with proven skills.Start learning today for free Move Your Career Forwardwith certification training in the latest technologies.Start your trial today
Microsoft Office

From novice to tech pro — start learning today.