I must have pushed something that deactivated my remote

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I must have pushed a button or series of buttons on my remote because it suddenly doesn’t work. The batteries are good but will not unlock or lock the doors. The car will start but I was holding the key fob in my hands after unlocking the car and suddenly couldn’t lock it back. Please help! Thanks in advance.

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2002 Q45 premium sedan

[3Q Jay]

Do you have another remote that you can confirm it's actually the subject remote (not for example the central electronics)?
May just need to re-program the remote that stopped working. I'm not sure of the sequence for the 3rd gen, but I'm sure it's out there, and likely a series of key in/key out, manually flip the driver's lock from inside, etc.

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Yes I confirmed neither remote works now. Both previously did. That’s why I think it’s something I pressed in some sequence that I’m not aware. I do recall being able to hold down a particular button or buttons to make the horn sound or not sound but wasn’t aware you could turn of the remote control somehow.

[3Q Jay]

OK, we're getting somewhere....
If neither remote works then it is likely the receiver module. I had this happen on one of the G50s.