Hi André,
this is about qemu's ability to either emulate and/or pass-through a TPM.
A bootable stick of 21.04 would be fine, then please run:
a) whatever you tried to do on 18.04 that failed you
b) the passthrough case I mentioned above
  $ sudo qemu-system-x86_64 -nodefaults -S -display none -monitor stdio -tpmdev 
passthrough,id=tpm0,path=/dev/tpm0 -device tpm-tis,tpmdev=tpm0

With qemu 5.2 the initially reported issue of "Property 'tpm-tis.tpmdev'
can't find value 'tpm-tpm0'" should be gone. If you could confirm this,
that would help.

Then if it is indeed gone continue to tweak your command to achieve what
you actually wanted to achieve (to check if there are other issues
left).

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https://bugs.launchpad.net/bugs/1903864

Title:
  qemu-system-x86_64: -device tpm-tis,tpmdev=tpm-tpm0,id=tpm0: Property
  'tpm-tis.tpmdev' can't find value 'tpm-tpm0'

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