I had the option a few days ago and now it has disappeared in both my phone and my wife's.

I'm seeing the same issue as the parent. I've check the alexa app under account settings and the option does not appear. The last version on the app store is from 2 weeks ago. I wonder if this is a web view and they're exposing it to different users at different times.

It doesn't show up in my Alexa app (iOS), and I am running the latest version (I have auto-update enabled). I only see Recognized Voices, Guest Connect, Voice Purchasing and Workouts. I see online references to this setting as long ago as November 2020[1], so it's concerning that it's still missing for me.

Edit: I just realized that all my Echo devices are 2nd generation, which apparently don't support Sidewalk[2]. I wonder if the menu item only shows up if you have devices that support it?

[1] https://www.aftvnews.com/amazon-has-started-switching-sidewa...

[2] https://www.tomsguide.com/reference/what-is-amazon-sidewalk

yup,Alexa app, which I haven't opened since at least last year, and had all devices unplugged, found it buried in there - set to [ENABLED]. I've never seen a notice/alert/opt-out opportunity, and I would have noticed it.

So, yes, in at least some instances, Amazon is doing a stealth-enabled rollout.