Sending, receiving, and organizing email in Outlook.com
Hi,
I think that might be more of an Amazon's configuration issue with Microsoft requirements which are strict these days.
Add both the exact Amazon sender address and the relevant Amazon domains to Settings → Mail → Junk email → Safe senders and domains. Amazon can send from different addresses depending on the type of notification.
Next,If the message initially appears in Inbox and is subsequently moved to Junk, create a rule using the exact From address with the action Move to → Inbox. If possible, place this rule at the top of your rules.
Third, . In Outlook.com, open it and use More actions (⋯) → View → View message details. Can you post the details i.e. the message header?
I look forward to hearing from you to get the results of the troubleshooting.