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This happened to me too. I had to update my BIOS to the latest version from Lenovo's website before the TPM 2.0 would even show as available to enable.

I ran into this a while back. I had this issue with a similar setup. Run the PC Health Check app from Microsoft—it usually gives a more detailed breakdown than the update screen. If that’s still vague, check your Secure Boot status in the BIOS, that was the sneaky culprit for me.

Yeah, Also, after you enable it, did you save and exit the BIOS properly? Sometimes it's an easy step to miss. Good luck!

This happened to me when tuning a game. I used a free tool called CPU-Z to get a clear breakdown of all my cores and threads.