Great to hear. TPM is totally usable if your threat model can tolerate the risk. Sadly Linux is a bit lacking support for TPM in FDE. You can try the Nitrokey with GPG method without pin I wrote in the other thread if you hit the wall. Good luck!
Here’s a guide if you want FDE with TPM: https://blastrock.github.io/fde-tpm-sb.html
That I doesn’t know Ubuntu patches it out.