Tracking number notification is not being emailed to customer when tracking number updated in order

[canopy-health]

Please help,

1. Customers are receiving order confirmation emails (see screenshot):

2. Our api is uploading tracking numbers once orders are shipping:

3. BUT, tracking number notification emails are NOT sending when information is updated in order:

4. Settings seem correct (but are we missing a checkbox?, see screenshot):

Thanks for any guidance you all can provide,

Pete

[VMus]

Yes! I have this same problem. Have you found any solutions for this?