It sounds like a problem of organization (your tasks are too easy to block, maybe you lack autonomy or authority) and of communication and perspective (the coll

It sounds like a problem of organization (your tasks are too easy to block, maybe you lack autonomy or authority) and of communication and perspective (the colleagues who "never respond" have, or think they have, something more important to do, and you aren't able to convince them that helping you is useful) with far deeper roots than work from home. If "communication flows freely" only when you put everyone in a meeting room, your team needs meetings: why don't you have virtual ones over video chat?