Techdows published a tutorial about how you can enable TPM 2.0 for Windows 11 in BIOS.

Here's how you can enable TPM 2.0 for Windows 11 In BIOS

Microsoft has made a mess in communicating about system requirements for Windows 11, this made users believe they need to buy new PCs even if their device probably supports TPM, but is disabled by default in BIOS. 

Here's how you can enable TPM 2.0 for Windows 11 In BIOS