1996 E230 Remote Control Not Working

My 1996 E230 ignition key is not working. It will not open and close the door lock remotely. I change both its batteries and also tried to
synchronise (by pressing transmitter twice while pointing at the sensor in the internal rear mirror and then turning key to position 2 on steering lock, as prescribed by the owner's manual) but it still won't work.
Can someone help me.
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