I believe it does if you disable the tracking protection. The disgusting mess that is Microsoft auth relies on dozens of separate domains and I guess ITP blocks

I believe it does if you disable the tracking protection. The disgusting mess that is Microsoft auth relies on dozens of separate domains and I guess ITP blocks cross-domain cookie access. I don't know of a way to disable it per-site though so you either have to use a separate browser or severely compromise your privacy by disabling it globally.