Hi, I have the same problem, did you find a fix for it?
When I run tmp.msc or on Windows Security, the TPM is perfect.
At the moment I start Valorant, the TPM 2.0 is disabled. The only way to re-enable TPM is to shutdown and restart PC.
This behavior started since last week.
No clue about what Valorant or the anti-cheat Vanguard are doing.