Hotmail (exchange) in MacOS Mail app doesn't sync
I have unusual Hotmail behaviour. The biggest problem is that my Hotmail account on my Macbook (using Apple/MacOS Mail) doesn't sync the read emails. So if I read an email on my iPhone or using the browser portal, it still shows as unread on my Mac.
However if I read it on my Mac, it syncs in the other direction, showing it as read online and on my iPhone.
If I delete and re-add the Hotmail (as an Exchange account), those emails are now properly shown as read. However, the same problem exists moving forward: emails read on my phone/online still appear as unread on my Mac.
Very frustrating, because now I don't know which emails I have actually read when I look on my Mac! Any help is appreciated.
MacBook