Remote working has mainly two modes of communication, email type asynchronous communication, or an audio/video call.
Synchronous Communication is real-time and is best for discussing job performance, talking casually, brainstorming and to fire someone.
Asynchronous Communication is deferred (like email) and is best for important announcements, in-depth discussions, feedback and sharing of ideas.
One has to choose the right medium to be able to successfully request something specific. Also, find the balance of being gracious while making a specific request, yet be clear and explicit.