Despite having a deferal or Sequoia, we have just seen a few dozen Intel based Mac's upgrade themselves to from sonoma to Sequoia 15.1 today. Has anyone else seen anything like this happen?
The software update deferral mechanism isn't 100% reliable. As @Shyamsundar mentions having multiple deferral profiles in place will create a problem, but even if you only have one deferral profile you'll still see some Macs manage to update. Use the Feedback Assistant to file feedback with Apple that if they're only going to provide one option for deferring updates they need to make it a more reliable option.
Yes, had a few Intel Macs upgraded. We have only 1 deferral in place (fixed this with the Ventura upgrades). I have the restrictions to block the macOS Sonoma installer as well.
No rhyme or reason why these upgraded. Happens every year.
