Dear John D. Brady,
Good day! Thank you for posting to Microsoft Community. We are happy to assist you.
To understand the issue and provide possible solution, we need more details from you, please kindly provide us the following information. Thanks in advance!
Typically, to sign in with a bar code for Microsoft 365 email, you need to install Microsoft Authenticator app first and follow the steps below:
1. Open the Microsoft Authenticator app on your iPhone or iPad.
2. Tap on the "+" icon to add a new account.
3. Select "Work or school account" and scan the QR code provided by your organization.
4. Enter your username and password when prompted.
5. Follow the prompts to complete the multi-factor authentication process.
If your query is a different scenario, could you please provide us with detail and screenshot of issue?
I look forward to your update. Kindly note that the above requested information is required for further analysis and troubleshooting of your situation. Your patience and cooperation are much appreciated.
Thank you for your precious time. Have a nice day.
Sincerely,
Libeamlak | Microsoft Community Moderator