Bluetooth pairing problem for Folio Keyboard Case for iPad 4/3/2

I have a Folio Keyboard Case for iPad 4/3/2 TC941 that I have previously paired with my iPad. I now want to pair it with another iPad. I unpaired from my previous iPad.

When the iPad snaps into position, the green and blue light both come on for several seconds. I press the blue function key and the C key which has the Bluetooth logo on it, but the keyboard never appears in the list of Bluetooth devices in the iPad’s settings menu.

When got this Folio Keyboard Case I recall that pairing was not as simple as Function-C, there was some other key combination. I’m wondering if anybody knows the right way to pair.