Symptoms

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Testing Windows Credentials would fail with an error message : "Module Credentials could not be found".

Cause

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Installation of MID server on the unsupported Windows version. This was noticed on Windows 10 workstation, but may be applicable for any unsupported version.

Resolution

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Install the mid server on a supported version. Below is the requirements from London version, but refer the instance version for the actual mid server requirements.

MID Server supported systems : 
https://docs.servicenow.com/csh?topicname=r_MIDServerSystemRequirements.html&version=latest 

Windows server: To discover Windows-based servers, run Service Mapping patterns, or execute Orchestration commands on Windows devices, the MID Server must be installed on a Windows server. The MID Server supports all Windows Server 2008, 2012, and 2016 editions, virtual machines, and 64-bit systems.

Note: .NET Framework version 3.5, 4.0, 4.5, 4.6, or 4.7 is required for Service Mapping support and for Windows pattern-based discovery.