Hi Raven,
Thank you for posting. You may refer to the article and follow the steps to get the details about Scan the QR code page, see under To set up the Microsoft Authenticator app
For your reference: Manually add an account to the app
However, we have dedicated support team Microsoft Authenticator app if you still having problem then I would suggest you please contact our Microsoft Authenticator app forum and there experts’ will focus on the issue to get it resolved more efficiently.
Your time and understanding will be highly appreciated.
Note: Please do not call phone number above that is a known Tech Support SCAM phone number. We have spam reported and deleted that post.
Best regards,
Shyamal