most of the phishing emails bypassing my spam filters (on Fastmail) recently have been from prod.outlook.com it's almost impossible to figure out where to repo

most of the phishing emails bypassing my spam filters (on Fastmail) recently have been from prod.outlook.com it's almost impossible to figure out where to report spam; most of their support articles are about how you report spam in Outlook instead. For reference, those reporting emails are: phish@office365.microsoft.com junk@office365.microsoft.com but you get zero feedback, and I keep getting repeat phishing too they care so little about cleaning up their own act, i'm considering just rejecting their stuff with a bounce message. i checked, and there's very little important traffic from prod.outlook.com arriving in my inbox.