When I first launched Bixby Developer Studio, it greeted me with a startup screen with a Login button. I clicked on it and it opened a login page in my browser. I logged in that page using my Samsung developer account. The login was successful and a pop-up appeared asking me if I will allow the page to launch Developer Studio (which was already open at that point). I allowed it, but nothing happened; Developer Studio was still showing the startup screen.
I restarted the application but it again showed me that startup screen with the login button. If I click on the login button, it will just take me again to the login page in the browser. And then nothing would happen if I login again.
I'd suggest verifying if your browser is configured to accept cookies. If that information is verified and the problem still exists, there might be additional information in the ide.log file that can provide more insight
To get that information, follow these steps:
Feel free to post the errors here or if you prefer, you can open a ticket with Bixby Support too.