Hello,
As @ztrubow mentioned, PKIX certification path errors are usually related to SSL/certificates (as mentioned in the exception) - please see [1] for details on a similar issue. Perhaps there is an intermediary (firewall/proxy or something) in between your desktop where the workflow is running and the target S3 server that breaks the certificate chain and makes it complain. If that’s the case, you could try adding the missing certificate(s) to your AP client’s cacerts file and resolve the issue that way.
Did you ever have to undergo a similar process on your old computer?
Or - are you accessing the S3 service from the same exact network/network path that your colleagues are?
Regards,
Nickolaus