The latest versions of Amber and Fountain seem to play nicely together again, allowing you to once again sign in with Amber. 

 Was just trying that — still not working on my end. I downloaded both today, are there any newer updates? 

 Running Foutain 1.1.6 & Amber 2.0.8 

 Amber 2.0.8 fixed it for me. Though I still have Fountain 1.1.5. 

 Funny, might need to downgrade 😂