Import-PFXCertificate password issue
Try surrounding the plain text password with single quotes instead of double quotes. I had a password with $ in it that gave me the same error until I swapped the quotes.
I was able to resolve the same issue in my case after I have stumbled upon similar post in ServerFault - Wrong password during pfx certificate import Windows(10, 2016)
My certificate was encoded during export to PFX using AES256-SHA256, switching to TripleDES-SHA1 resolved the problem.