I've already unsubscribed to this conversation by clicking on subscribe (!) and then unsubscribe. If I click on subscribe now...it proposes to ...subscribe, so it works as...intended (?).
WTH are you doing @microsoft . If you need an UX or project manager, I'm available 1-2hours/week, that'll be probably more than what your current one(s) put into it.
Serious offer.