Name the device and the preference
Record the actual client device and setting that cannot be changed. Compare with another device only if it serves the same intended purpose. A television used by children may intentionally have a different policy from the administrator’s phone.
Inspect global and device settings
Channels documents server-side settings under Clients, with global policies and per-device overrides. A configured server-side option is not adjustable in the app, and a device-specific choice overrides the global one. Inspect those layers before treating an unavailable local control as an app fault.
Preserve the existing values and the reason for any intentional restriction. If changing the policy is appropriate, make one deliberate change at the owning layer. Reinstalling the client does not explain a server policy that would be applied again.
Verify the affected device
Return to the named device and inspect the preference and its ordinary behavior. Check a second device only to confirm the intended scope. Record whether the change was global or local to that device so another administrator can maintain it correctly.
No Channels preference was changed here. The practical result is a known policy owner, not a claim that every locked control is caused by server configuration.
Questions answered
Can one device override a global server setting?
Channels documents per-device server settings taking priority.
Sources & further reading
Official references for the subjects discussed. Service terms and device software can change.