Can't Login in Preview, Can Login in Browser Tab

As the title says: I cannot login to my web app I’ve built using the Preview Feature, I type in my login credentials and it refreshes back to the Home Page where the Login button is located.

In my own browser tab, I login with my credentials and it sends my into my app.

I’ve been going back and forth with Replit Agent checking logs, and it seems to understand whats wrong with the flow, tries a solution and it still doesn’t work. I can do this 20 times and it will think it found the issue and solve it. Let me test it and it will fail again, and again.

Anyone seen this before? Any Idea what I can do about it?

It’s becoming a pain in the ass, because I want to use the element selector while guiding the agent.

Did this get sorted? I have something similar, where I cannot see the preview of the app at all. It is stuck in an endless loading state. The ‘new tab’ button and everything on the preview pane is basically greyed out.