Using Outlook for iOS in business environments for email and scheduling
Hello Yuon a,
Welcome to Microsoft Community.
I am a Microsoft user just like you, I hope you are doing well.
Sorry for the inconvenience. However, this is likely not an issue with your Microsoft account. I will suggest you wait 24 hours and try again to check if you will receive code. Understand that most times the system will not send code if you have requested multiple times (likely for security reasons).
Also, did you check your spam folder?
Please let me know if you need more assistance.
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Warm Regards