Clients aren't able to see upcoming appointments.

We recently imported a bunch of upcoming appointments into Acuity Scheduling the problem is that some of the clients aren't able to see these new upcoming appointments in their schedule, even though the appointments clearly appear in under the client entry on the backend. The affected clients are able to see their previous appointments when they log in. Furthermore, only some of the clients seem to be affected by this problem.

We've done what we can to try and troubleshoot this, but nothing seems to have fixed the problem. We're not experts on using Acuity Scheduling, and so it's quite likely that there's some feature that we're unaware of that's preventing the appointments from showing up on the client-side schedule. However, neither searching the support documentation nor Google has brought us any leads.

Any tips on what could possibly be causing appointments to not show up in clients' schedules?