Some of our customers use Microsoft's Office 365. Due to that they also use Microsoft Teams for collaboration. Recently, out of the blue, I ran into a "redirect loop mystery" in Teams. Basically I was able to login to our Teams (which we only use when recording video calls). But when I tried to switch to a customer workspace I was able to get in, but got immediately redirected back to our own workspace. This issue affected both the official Teams client for Linux, as well as the Chrome browser. Fortunately this was a well-known issue that could be fixed by relaxing cookie security settings in the browser.