Question about Logitech Slim Folio Pro

Love All I can no longer connect my Slim Folio Pro, which I just bought, to the iPad Pro 4th gen 12.9. Bluetooth from the iPad recognises the device as "SLIM FOLIO PRO" but then after pressing the battery button on the keyboard I always get the message "Pairing failed", this although the Slim Folio pro is switched on (it is fully charged, i.e. the green LED burns permanently when you press the battery button on the top right). I have already tried various solutions: - Switch Bluetooth on/off on the iPad - Restart the iPad - Restart iPad with (Volume up, Volume down, Power button) None of this helps! I should note that the Slim Folio pro was recognised first and since I restored the backup of my old iPad and upgraded from 13.7 to 14.0.1 beforehand, the connection no longer works! Thanks for any help JFB