@NikCharlebois The property 'PasswordPolicies' does not need to be exposed as a parameter, because we already have the parameter 'PasswordNeverExpires' which actually sets the property 'PasswordPolicies'. Or we remove the parameter 'PasswordNeverExpires' and expose 'PasswordPolicies'. Exposing both makes no sense from my point of view. With the current code change we would have the new parameter which is never honored. 'Set-TargetResource' would have to be modified for that.

'PasswordPolicies' would accept 'DisablePasswordExpiration', 'DisableStrongPassword' or both 'DisablePasswordExpiration, DisableStrongPassword' and should return NONE or NULL when not defined. (would have to be tested ...)
https://learn.microsoft.com/en-us/powershell/module/microsoft.graph.users/new-mguser?view=graph-powershell-1.0

For just fixing the original issue I would recommend to remove the new parameter.