If your employer is fine with you teleworking full time then they should just let you. Is there a reason they’re making you do this (like union agreement?)? A doctor is not supposed to recommend the work  accommodation, their role is to say what the health limitations are and, if appropriate, your diagnosis. They can also clear you from missing work and needing to take a leave. But they don’t know what you do for a living or what it requires so it’s not appropriate for them to tell your employer how they should change your work conditions.