OneNote sync difficulty with PC and Android

Question

I converted from Evernote and one thing I miss is the easy, RELIABLE, sync. I just got a new phone, so memory, cache issues aren't it. I made a new section on the PC, and 1 day later, despite manual sync on PC, Android doesn't show that section. I can delete on PC and it deletes on android, and some other notes sync just fine. So it's an erratic effect. When this happened before, I created another section in that notebook, moved the page, and it then showed up on Android. Any help would be appreciated, as I can't trust my android to have all of my notes created on the PC. What about from Android to PC? Sometimes slow but seems to do better.

One more thing. I went to the Windows Store to try and get the OneNote for Win10, as I read sync is much better. I can't find it. I downloaded the one version on the store and as best I can tell, I still have the same version. It has File in the top left which means it is the 365 version.

Update 2/9/24: I tried adding a new section to the Notebook and it did sync. But the old Section never did. I deleted it and got a message the note was corrupted. No Idea why that would have happened, and it's frustrating that adding a new section and note leads OneNote to corrupt them? Cutting and pasting that note to the new section in that Notebook worked.

Update 2/12/24: One problem remains. If I email a note (******@onenote.com), I don't see it in Android until I open it on the PC.