Dishwasher does not dispense cleaning tablet

Detergent goes in the drum with the clothing, fabric softener in the middle of the agitator, the drawer is for delayed start if using soap powder

You could have a clog in the housing underneath the dispenser where the water flows through a hose into the tub.
Pull the dispenser drawer completely out.
There is a tab that needs to be depressed to release the drawer and remove it.
Check the opening at the bottom of the housing just inside the dispenser housing opening to see if a small sock or garment is clogging this opening.
Reach down into this opening to see if an item is inside the hose.
This is the normal issue that will cause water to leak out of the dispenser housing.

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Wash the dispenser drawer thoroughly with warm water. Make sure that you pull off the siphon covers and wash all siphon holes. This process is described in your owner's manual. Replace the dispenser drawer and try the washer again.

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The soap dispenser drawer is supposed to open during the cycle. Try first to understand if the drawer is opening or not during cycle.

If the drawer is not opening, then check if the opening mechanism is stuck, if it is blocked by dirt and soap, if it is broken, or if something, for examble a basket too close to dispenser drawer is preventing the drawer from opening.

Some dishwasher works only with powder, in that case indications are given on the owners manual.

If the drawer opens and the table, or powder is still staying stuck in the drawer, then that means that the spray does not have enough power to solve the tablet.
In that case check spray arms and impeller pump.Also check water temperature.

If the problem is also happening with powder, then it is probably a drawer not opening on cycle.

try take the drawer out and clean the inside where the drawer fits into. It may have a build up of soap/softener etc.. then give the drawer itself a good clean including the bottom of the drawer. I have this problem from time to time where there is a build up of soap etc...

its either the dispenser or the timer/pcb.