Hello, and Welcome to the HP Support Community!
Try all the "simple stuff" - reboot the tablet, check the batteries in the keyboard, delete the pairing from the tablet, then start all over again!
Turn BlueTooth back on, turn the keyboard on (and do anything necessary to place it into "Pairing Mode"), have the tablet scan for new devices.
I'm guessing it may just be the batteries in the KB. 😉
WyreNut
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Former Expert in the PalmOS, WebOS, and Android sections of this Community Forum.
I am a Volunteer here, not employed by HP.