PowerEdge T150 system update

I just purchased the PowerEdge T150.
The server still has no OS installed.
I plan to install Ubuntu Server 22.04 LTS.

I started the server and, following the leaflet that came in the box, I set up the Lifecycle Controller.
No problems, all worked well.

Next I am advised to update the firmware.
I could update some of the components.
But for 3 of them, I received the following warning prior to updating:

It is detected that the Trusted Platform Module (TPM) is enabled with pre-boot measurement. It is possible that BitLocker protection is enabled on the system. When BitLocker protection is enabled, updating following components will require that a recovery password is entered or a USB drive that contains a recovery key is inserted during the next system boot.

The components in questions are:

• Dell EMC iDRAC Service Module Embedded Package v5.1.0.0, A00
• Broadcom NetXtreme network device firmware, 22.3 (twice).

I cancelled the update of these 3 components because I am unsure whether I should do something before risking this update.
I confirmed in the BIOS that I do have TPM enabled.
What do I need to do?
Do I need to create some sort of key and save it before attempting the update (if so, how)?
Or can I just ignore the warning and proceed with the update?

I do not plan to install Windows, which is what the BitLocker in the warning seems to apply to. But still, I am confused.
Any suggestions on what to do, or pointers to supporting readings on this, are greatly appreciated.

Many thanks,
bruce