Unable to login using Service Account login

Hi OctoDeploy peps.
i am setting up Octodeploys deploy for our team using Service Account for authentication. looks like it is picking up users form the Authentication, however we are unable to get the registered users to login. the error is just rejecting the username password with “Invalid username and password error”, Dianostic logs doesnt have any errors, and i have generated an API key for users however they still unable to login. Am i to enter these API keys somewhere?

we are using version 3.5.2