We do not have information specific to NTLM versions supported by PAM. You can see on the PAM Platform Support Matrix that PAM supports the following Windows versions: 2008 R2, 2012 R2, 7, 8.1, 10 and 2016. PAM should support whatever version of NTLM is on these versions of Windows. If you believe that is not the case then you should open a Support ticket and provide the details. We'd need the Windows version(s) and the PAM version. Then we'd be able to try to duplicate what you observe.