Hi @Will Godwin ,
Thanks for reaching out.
I understand you are trying to update and delete phone authentication method for B2C users or consumers and unable to do so.
Unfortunatey, Phone authentication method is not supported for B2C users or consumers signed up by different identity providers using Graph API as of now.
Only for those users which are created within the organization in B2C can be updated phone authentication method using Graph API.
I would suggest you post this idea at the Azure Feedback Portal, which is monitored by the product team for feature enhancements.
Thank you for your time and patience throughout this issue.
Hope this will help.
Thanks,
Shweta
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