Eventarc trigger with Network Attachment in nam5 region

[prefschwartz]

I have a Firebase project that was setup with the Firestore database set to the nam5 region.

I am trying to create an Eventarc trigger through GCP for an update on a collection in Firestore. Because that database is my default one I must create the trigger in the nam5 region.

The problem is I need this trigger to be an internall http trigger, which means I have to create a network attachment. But when creating a network attachment the nam5 region is not an option. 

I've tried creating a network attachment for us-central1 but it still won't show up as on option when creating the trigger.

If I try and create the trigger in the us-central1 region then it throws an error saying there is no default Firestore database in that region.