My query is about the SSO authenticator in survey flow.

I have added the SSO authenticator specifying:

Authenticator type=SSO

Capture respondent identifying info

emailz=emailz

encryption method = 3DES

mac method=md5

leeway = 300

key = L+aWQli7FSmO3oqt (it is not a secret)

When I click on Generate token I enter a value for emailz and a test link is generated.

When I browse to the test link I get 

Unable to decrypt the token.

How can I troubleshoot this?