On my Pixel 7A I can’t activate the “AI notifications”.
I think it was working earlier.
Every time I open the settings, the switch has moved to left.
Do you mean the “System Settings > Notifications > Notification Summaries” and / or the “Notifications > Notification Organizer”?
Yes, exactly that.
OK let me pass that to the developers. You are the first to observe it, much more of a hot issue was when upstream AOSP activated these by default before we realized it and then needed to disable them by default (but they should be re-enable-able I believe) 
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