Thus is caused by recent changes by Microsoft in Azure. The mobile attribute and some others cannot be updated using the admin consent granted to On Demand Migration application.
Manual steps from PowerShell required from customer to grant the access.
The corresponding service principal has to be granted at least Helpdesk Administrator role:
Work-around:
```$servicePrincipal = Get-AzureADServicePrincipal -All $true | where AppId -eq b58728b1-0960-4f78-96d6-1a4063d1701a
$role = Get-AzureADDirectoryRole | Where-Object {$_.displayName -eq 'Helpdesk Administrator'}
Add-AzureADDirectoryRoleMember -ObjectId $role.ObjectId -RefObjectId $servicePrincipal.ObjectId```
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