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What is the model number of your tablet please?
Okay, is it a Samsung, Android, etc...?
Okay, try this please.
Go to the Settings menu. Tap and hold the top bar on top of the screen and pull it down. This will bring you to the Settings menu.
Head to the Accessibility menu. Tap “More” at the right side to view additional options, then tap the “Accessibility” button at the bottom to access the Accessibility menus
Turn on Text-to-Speech. Toggle the switch beside this option to turn it on.
Turn on Voice Guide. To do this, toggle the Voice Guide switch to the On position.
Press and hold power button for 20 seconds, then release.
Power back on and check.