Need help!!!!!

I have a 2010 mazda 6.
Only way i can lock my car doors now is by (except the driver door) manually pressing the button on the doors. I can not lock them(except the driver door) by pressing the central lock button on drivers door or using my key. But the unlock works both on my key and by pressing unlock button on drivers door.

I believe this is not an issue with my key (remote) or its battery because the unlock(all doors), trunk open work well with my remote.

Any clue what is causing this? Any help would be appreciated. Thanks
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