Hello @Bill Burke ,
Thank you for Reaching Microsoft Q&A.
Yes, the Microsoft Authenticator app is required to authenticate with Azure cloud on an iPhone X. The app provides an additional level of security to your Microsoft work or school account or your Microsoft account.
Regarding the issue you are facing, it sounds like you may not have set up two-step verification for your personal account. To set up two-step verification, you can follow these steps:
- Go to the Microsoft account security page.
- Sign in with your Microsoft account and click on Two-step verification
- Select Manage for two step verification
- Follow the prompts to set up two-step verification. You will be prompted to choose a method for receiving verification codes, such as through the Microsoft Authenticator app or via text message.
Once you have set up two-step verification, you should be able to use the Microsoft Authenticator app to verify sign-ins for the Azure app, Outlook app, and Teams app.
Hope this helps. Do let us know if you any further queries.
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Goutam Pratti