How to talk to an actual support person at Microsoft about Sentinel setup and validation?

I have followed the documented steps to "Open support requests" and tried going to the Services Hub here (https://serviceshub.microsoft.com/home), and I Successfully sign-in with the pass code they email me, it even asks me if I want to stay signed in, which I click "Yes", then it immediately signs me out. It's crazy. I tried Chrome, Firefox, and Safari. Checked cookie settings for the site. When I call support and tell the robot I would like help with Microsoft Defender, it tells me to go to the Azure portal to submit a support ticket (then hangs up on me). Azure portal tells me to go to the Defender portal to submit a ticket. In Defender they give me a phone number, which I call and it tells me to go to the Azure portal. Round and round we go, it's crazy. I have tried everything in their documentation, AI robots, chat bots, and automated phone support tells me to try. But still no actual support. So far, ROI = zero. And it appears my question here in this community has also gone to /dev/null