Error using swtpm for TPM2

[X Tec]

Using QEMU 6.2 and swtpm 0.5.3.

So I start swtpm with:
swtpm socket -t --tpm2 --tpmstate dir=~/tpm0 --ctrl 
type=unixio,path=~/tpm0/swtpm-sock --log level=20 -d

And use these options for QEMU:
-chardev socket,id=chrtpm,path=~/tpm0/swtpm-sock -tpmdev 
emulator,id=tpm0,chardev=chrtpm -device tpm-tis,tpmdev=tpm0

Try to run QEMU and I get this error:
tpm-emulator: TPM result for CMD_INIT: 0x9 operation failed

Then QEMU aborts, and even the swtpm process seemingly gets killed (is no 
more), with or without the -t option.

Could someone help please?
Thanks.