tpm2 and opensll have different hmac signature results when using the same key

[Benson666]

I wanted to generate a hmac key by openssl, and then imported the hmac key into the tpm2.After that, I signed the same information using openssl and tpm2 respectively, but the signing results were different!
Here are my codes:

echo "Hello world!" > message.txt
openssl rand -out hmac_key.bin 32
tpm2_createprimary -C o -g sha256 -G rsa2048 -c primary.ctx
tpm2_evictcontrol -C o -c primary.ctx  0x81000001
tpm2_import -C primary.ctx -u hmac_pub.pem -r hmac_pri.pem -i hmac_key.bin -G hmac
tpm2_load -C primary.ctx -u hmac_pub.pem -r hmac_pri.pem -c hmac.ctx
tpm2_evictcontrol -C o -c hmac.ctx 0x81010002
tpm2_hmac -c hmac.ctx -g sha256 -o message_hmac_tpm.bin message.txt
openssl dgst -sha256 -mac HMAC -macopt key:"$(xxd -p hmac_key.bin)" -out message_hmac_openssl.bin -binary message.txt
cmp message_hmac_tpm.bin message_hmac_openssl.bin

The result is:

message_hmac_tpm.bin message_hmac_openssl.bin differ: byte 1, line 1

The two files have the same size:

-rw-r--r-- 1 root root 32 Dec 12 18:11 message_hmac_openssl.bin
-rw-rw---- 1 root root 32 Dec 12 18:11 message_hmac_tpm.bin

What went wrong?

[JuergenReppSIT]

The files should be equal if you use:
openssl dgst -sha256 -mac hmac -macopt hexkey:$(xxd -p -c 256 < hmac_key.bin) -out message_hmac_openssl.bin -binary message.txt