Thank you for posting this in Microsoft Q&A.
I understand you are unable to create an app registration in Azure UI using your subscription, and you are looking for an alternative way to do app registration, like PowerShell.
Could you please share more details about the issue? Did you get any error messages?
Yes, it's possible to create an app registration using PowerShell. You can use the following script:
Connect-MgGraph -Scopes Application.ReadWrite.All
New-MgApplication -DisplayName application1
For your reference: https://learn.microsoft.com/en-us/powershell/module/microsoft.graph.applications/new-mgapplication?view=graph-powershell-1.0
Hope this helps. Do let us know if you any further queries.
Thanks,
Navya.
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and Yes
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