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Hello derrickgingras,
From your description, my understanding is the email sent with the access code is always sent to the Junk folder in Outlook. If I misunderstand anything, please feel free to correct me. As far as I know, there are two different ways to set it.
For end user: End user can mange their Junk Email filter in Outlook client. If emails are sent from the same sender, they can add the safe sender list to always trust the sender or Turn off Automatic Filtering via Junk > Junk Email options. For your reference: Overview of the Junk Email Filter.
For administrator: Admin can set a transport rule to by pass spam filter or set the SCL value to lower than 5. To do this, sign in to Exchange admin center > mail flow > rules. Click add button and select Bypass spam filtering. For more details about transport rule, you can refer to this article.
I hope this can help. Please let me know if you need any further assistance. I am glad to help you further.
Best Regards,
Sylvie