Hi Julie-Anne,
Thank you for sharing your question. I understand how annoying it is to get spammed with email alerts for doc comments when you can't find the way to shut them off in settings. It's super confusing when things don't look like they should.
Based on my knowledge Microsoft 365 sends alerts for comments, replies, and mentions automatically. You have to change these alert settings in your account instead of inside the doc or app. Sometimes, updates move these options around. That’s likely why you’re not seeing them in OneDrive or the Office app settings.
Please follow these steps.
To fix this, log into office.com. Then, click the gear thing at the top right, head to Settings > Alerts, and turn off the stuff about comments, replies, and file stuff. If your files are in OneDrive or SharePoint, try right-clicking the doc in the web thing and mess with alert settings there. Right now, Word, Excel, and PowerPoint don’t have a button to turn off comment alerts for each doc.
May I also ask have you checked the alert settings in your account on office.com? Let me know if that works. If not, I’m here to help!
I hope this helps
Best Regards,
Noel