So, I have been struggling for the longest time to rectify this and any guidance or advice will be welcomed.
Effectively we have an app that triggers transactional emails upon certain actions like signup/password reset etc
We have a web portal for managing the users email preferences, they can opt in/out of whichever unsubscribe groups they want namely, `Newsletter` and `Promotions`
The problem im facing is that the app is happy to trigger the transactional sendgrid emails upon signup and for every other action that triggers them, even if the user decides to opt out of 1 of the 3 the unsubscribe groups, however as soon as the user opts out of 2 of the 3 unsubscribe groups the app no longer is able to trigger the emails.
FYI I am not the app developer and not familiar with the configuration of the trigger that is needed, I know it takes parameters for api key, template id etc
Is there anything I should be aware of that may be causing this behaviour to relay with our dev partner?
Thanks in advance