I have to re-login into the luci-scheduler service every day, which seems excessive. What makes matters worse is that when I visit https://luci-scheduler.appspot.com/jobs/v8, click Login button and select my account, I am redirected to https://luci-scheduler.appspot.com/ and have to re-type address again (or frantically hit the Back button in hopes that I will skip the page that redirects me back to the https://luci-scheduler.appspot.com/). 

IIRC, I've reported similar issue for some other infra service several years ago, but I can't see to find it again. There the issue was with some kind of access tokens. Vadim will probably know more.