Compare inside and outside the session
Use the authorised exit method for the device and operating-system version, then check ordinary volume behaviour outside Guided Access. Keep the application and listening output in the note. Buttons working normally outside the session is different evidence from buttons failing everywhere.
For a hypothetical family viewing setup, a previous session may deliberately have prevented a child changing volume. Starting the same app again can bring that preference back. That can surprise the next viewer without any app update or physical damage having occurred.
Review the remembered options
Follow Apple’s current session-settings instructions and inspect the hardware-button choice. Do not share the private Guided Access passcode in a support message. Let the person responsible for the session decide whether volume adjustment should be available for the intended task.
Practise the start and finish before handing the device over again. Check that the viewer can use the controls they need at a comfortable listening level. A restriction suited to passive viewing may be wrong for an interactive activity or a viewer with different access needs.
Keep account and content controls separate
Changing a Guided Access hardware option does not change a service’s parental profile, purchase rules or programme entitlement. Preserve those account settings while fixing the local button state. Avoid reinstalling the player or resetting account passwords as a first response to the session-specific result.
If the buttons also fail outside Guided Access, record that different pattern and use Apple’s hardware support route. Include device, operating system, session state and chosen output. This article describes official session behaviour and a focused comparison, not a hands-on diagnosis of the reader’s phone or tablet.