Question TPM for Windows 11 support

Apparently Windows 11 requires a TPM2.0 module in order to run
https://support.microsoft.com/en-us...-your-pc-1fd5a332-360d-4f46-a1e7-ae6b0c90645c

I have an older motherboard,
ASUS ROG ZENITH EXTREME (AMD X399)

How can I determine
1) whether I have TPM but its just disabled
or
2) if I don't have TPM can I purchase a version that is compatible?
Thanks for any feedback!
In the user manual, page 3-14
https://dlcdnta.asus.com/pub/ASUS/m...TREME/E13369_ROG_ZENITH_EXTREME_UM_V2_WEB.pdf