I already told that you are using a very old version of WFA. I gave you the fix for that. But the cmdlet Show-WfaConfig is not available with that version. Show-WfaConfig is only available from WFA3.0 and above.
WIth WFA 3.0 and above the original issue of ps.cmd failing will also not be seen.
If this post resolved your issue, help others by selecting ACCEPT AS SOLUTION or adding a KUDO.