Spare key doesn't work to unlock door electronically?

I'm new to cars and my mom allowed me to borrow hers for the next two months while she's out of town. The thing is, she gave me her spare key, and the alarm won't work. The physical key unlocks the car, but I can't unlock/ lock it remotely. Any advice? The model is a Honda CRV

Do it the old-fashioned way and put the key in the lock.

Maybe the battery needs replaced?

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