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In this case, most likely there isn't a way to clear the PTT through the BIOS in this product.
For older products such as the Intel® Desktop Board DQ67EP and the Intel® Desktop Board DQ67OW with a physical TPM module, you could clear the TPM by moving the security jumper to position 2-3 as you can see on page 10 of this document but all the encrypted data would become inaccessible with this process.
Please check below for some useful links:
Trusted Platform Module Information - Intel
View status, clear, or troubleshoot the TPM - Microsoft
Hope this information helps.
Actually, there is a way to clear the PTT data by downloading a BIOS to a USB drive, plugging it in the powered off NUC and holding the power button for 3 seconds. This will boot to a special boot menu that lets you go to BIOS recovery. This will take a few minutes and clears all of the BIOS stored info. Follow the instructions here: Power Button Menu BIOS Update Instructions for Intel® NUC
I tried it out today and it worked for me. I didn't come up with this on my own, I had help from someone else at Intel. To that person, thank you very much.