Sorry about that, I am aware of the issue and I'll try to implement a workaround asap. It's because Safari doesn't allow 3rd party cookies, which Auth0 relies on, by default. You can fix it by allowing 3rd party cookies.
It's not my design, it's Auth0's. I'm the only dev working on Intention, so I have a limited amount of time to spend on things like user authentication, which is why I rely on auth0 to handle it for me.
Surely you can allow specific third party cookies for a specific domain, right? (I don't use safari so I don't know for sure)