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Sorry to inform you that it is simply part of the same bug. Your hunting it down and turning it on is unfortunately meaningless if you have the same issue as others (including myself) noted above. You'll find that it simply turns itself off again, most likely OR it says it's on but does nothing.
This just happened to me! My notifications randomly quit working out of the blue yesterday, and the "Allow notifications from iPhone" setting wasn't visible unless I searched for it.

I also noticed that notifications were delayed on my iPhone (was waiting 7-10 seconds for my Okta Verify approvals). This was/is a known issue with the "Summarize Notifications" (previously called "Summarize Previews") setting on the iPhone. I turned that setting off and back on, and notifications were coming through instantly on my iPhone again. I then restarted the Mac, and the "Allow notifications from iPhone" setting shows up again and notifications are now working there as well.

BTW, I upgraded to macOS 15.3.1 and iOS 18.3.1 right after they were released a couple of weeks ago, and things were working fine then. Both of these just quit working for no rhyme or reason yesterday. I'm not sure if these are two independent issues and that simply restarting the Mac would have fixed the notifications there, or if these two settings are interlinked somehow and turning "Summarize Notifications" off/on on the iPhone (to fix the delay) and restarting the Mac is the actual fix.
 
This just happened to me! My notifications randomly quit working out of the blue yesterday, and the "Allow notifications from iPhone" setting wasn't visible unless I searched for it.

I also noticed that notifications were delayed on my iPhone (was waiting 7-10 seconds for my Okta Verify approvals). This was/is a known issue with the "Summarize Notifications" (previously called "Summarize Previews") setting on the iPhone. I turned that setting off and back on, and notifications were coming through instantly on my iPhone again. I then restarted the Mac, and the "Allow notifications from iPhone" setting shows up again and notifications are now working there as well.

BTW, I upgraded to macOS 15.3.1 and iOS 18.3.1 right after they were released a couple of weeks ago, and things were working fine then. Both of these just quit working for no rhyme or reason yesterday. I'm not sure if these are two independent issues and that simply restarting the Mac would have fixed the notifications there, or if these two settings are interlinked somehow and turning "Summarize Notifications" off/on on the iPhone (to fix the delay) and restarting the Mac is the actual fix.
Updating to macOS 15.3.2 and iOS 18.3.2, same symptom, same fix. First failure since restoring the iPhone couple months back. Man this stuff is buggy.

... Jeff
 
OK. So I stumbled into a possible solution (at least for my two M4 Macbooks) when buying a new phone. It appears that if you "revoke access" and/or add a new iPhone (possibly re-add existing) that notifications will once again work.

This "fix" has stuck for several days on one Macbook, and for a couple of minutes so far on the other. 🤞


View attachment 2483810View attachment 2483809

Note: it is still buggy (still lists my old iPhone in Desktop & Dock). I suspect the phone must need to be present to fully remove????? I will try later for this.

View attachment 2483849
My notifications failed again recenlty, and this method didn't work again. I used the method mentionedby iStorm, and they started working again. Except I didn't see "Summarize Notifications" anywhere, I toggled "Scheduled Summary" as below

IMG_6473.png
 
Huh, today I migrated to a new-to-me phone that someone gave me. In getting it set up I then had the notification settings consistently appearing. Removing the placeholders UUID folder and Mac reboot seemed to get apps and notifications working. For now. But reading this thread may not be that stable yet anyway. We'll see. I still don't know how much I even want notifications from my phone, may turn off most apps eventually.
 
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