If Bit Locker or Win Magic drive encryption is used, the utility will exit after advising that the disk must be decrypted first.
On a newer Dell computer, try the F2 key while you see the Dell logo. Older models might use CTRL ALT ENTER or Delete or Fn ESC or Fn F1.
Keys most commonly used on HP machines to enter setup include F10 and ESC.
And the easiest way to not miss the time when you can enter the BIOS, is to press the right key even before you power on the computer and hold it until the BIOS comes up.
If that doesn’t work, you’re not pressing the right key or something is broken.
HP Trusted Platform Module (TPM) Configuration Utility Link: