2011 Tahoe... no power to dash or ignition?

I’m having trouble with my 2011 Tahoe. I’ve checked the main fuse box under the hood and confirmed there’s power with a multimeter. I also checked the fuse box in the cabin on the driver side, but there’s no power at all. I was told it could be the body control module, but I don’t want to replace it until I can confirm that’s the issue. Any advice?

My Chevy truck has a second fuse box under the second row seat. It has fuses that concern components in the dash. Maybe check that?

Did you do any work on it lately? Change an alternator or something?