Thanks for sharing the log. It includes the following:
38080/26: 10/1/2020 2:38:58 PM: The X.509 certificate with subject name CN=protegentidp.fnfis.com, OU=Enterprise SSL Pro, OU=Hosted by Fidelity National Information Services, OU=Corporate Account, O="Fidelity National Information Services, Inc.", STREET=601 Riverside Ave, L=Jacksonville, S=Florida, PostalCode=32204, C=US and serial number 00824E33752EFABCB5D95D8632ADEA0D77 is being used to verify the XML signature.
38080/26: 10/1/2020 2:38:58 PM: The X.509 certificate with subject name CN=global and serial number 016B4C056CBA is embedded in the XML signature.
We log both the certificate being used to verify the signature as well as the certificate that's embedded in the signature itself. You can see that these don't match which means the wrong certificate is being used.
I've attached the embedded certificate. Rename to .cer and use this for the verification.