I guess you'll need to disable the "Local Security Setting System cryptography: Use FIPS compliant algorithms for encryption, hashing, and signing" policy in Windows.
you can follow the instructions below to check if it is enabled or disabled and disable if necessary - you mentioned group policy, do you know if this policy is sent down?
Go to Start > Control Panel > Administrative tools > Local Security Policy. The Group Policy dialog appears.
Under the "Local Policies" heading, select "Security Options" and look for the entry, "System cryptography: Use FIPS compliant algorithms for encryption, hashing, and signing."
If entry this is enabled, disable it.