DUO SSO Credential mapping error

[VFB]

I've been trying to work around an issue where SSO isn't passing the user credentials over to storefront logon page. It populates the username, and I presume the password, but I receive invalid username/password error. I then click in the password field to apply the save password and it logs me in.

[boneyard]

try to log the variables and see if they contain what you expect.

if there are weird character you might give it a try with a very basic password for testing

nicest would be able to snif the traffic, but that will cost some effort and decrypting it probably.