This looks great.
What is the reason for adding the https://sso.tax? Why did you make SSO an enterprise feature?
Is it due to some (technical) reason that would require a monetary compensation to be profitable?
SSO has security benefits (on top of the maintainability aspect) which would also benefit small businesses.
If they're offering SSO using a 3rd party provider like Auth0 then they probably have to charge for it because of how expensive it is.
(https://aws.amazon.com/about-aws/whats-new/2024/11/amazon-s3...)