If you use push for MFA, you'll get at least two notifications. Please be patient as these can be 10-15 seconds apart. With codes, the first auth succeeds, but the second fails.
Students need to change their Microsoft account settings to use push notifications instead of OTPs.
Purdue University - Knowledge Base
How do I Change my Default Sign-in Method for Microsoft?
This article covers how to update your default sign-in method for Microsoft 365.
Only need pass phrase (assuming correct MFA settings and such)