I have testet BitLocker on Dell E6330 and Dell E7440 and it worked fine. In the Group Policy I have enabled the use of BitLocker without TPM and the recovery key is stored in AD DS.

When I try to activate it on a Dell XPS 13 9343 I get an error stating "TPM on this machine does not work With the current BIOS-Version. Contact the manufacturer to get instructions about how to Upgrade BIOS". (The Message is translated from Norwegian). The machine have the newest BIOS and I have tried to boot the machine with the hdd as the first boot object.

Any idea how to solve this?