Dishwasher does not dispense cleaning tablet

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.