I'm running into an issue here, too. Neither Safari nor Chrome seem to work.
On Safari, I had to disable my ad blocker to get the popup window. However, when I click the "Sign in with Oidc" button and get the popup, I click the "Authorize" button, and it simply says "Login completed." but doesn't log me in.
On Chrome, I get the popup, I log in as normal, and the window disappears, but doesn't log me in.