Problem exporting AAF to Sound Person

So I have had so many problems exporting out an AAF to the sound person and I'm hoping someone can help me!

I'm using Davinci 17.1.
I'm using macOS Catalina 10.15.7

I've tried getting AAF files to sound person two different ways.
1. AVID AAF
2. Pro Tools

Both partially work. Some of the audio files are there and some are missing. Also some are way out of sync. WHAT AM I DOING WRONG? I've attached screenshots.

Be sure to be current with both applications (ProTools 2021.6 and Resolve 17.2.2) as there have been numerous improvements in this area within both applications.

When exporting an AAF constrain the Resolve Timeline and do not use mixed rate media or mixed frame rates - only use audio media with matching sampling rate (e.g. 48kHz) and bit depth (e.g. 16bit).

Do not include compressed media such as mp3 or AAC and only use uncompressed LPCM on the Timeline.

Remove all audio transition effects, always use the Clip's fade handles.

Remove audio media spread across Track Layers, ensuring that only a single layer is present: Timeline menu > Flatten Audio Track Layers

Enable the following preference:
Resolve Preferences > User > Editing > General Settings > Align audio edits to frame boundaries

thank you Reynaud, there are a couple of details one might not think about.

Enable the following preference:
Resolve Preferences > User > Editing > General Settings > Align audio edits to frame boundaries

In v17 there is now a command under the Timeline menu on the edit page -> Trim Audio Edits to Frame Boundaries

Clicking this before exporting an AAF solved the "COM Operation failed HRESULT" error that I was running into.