[REQUIRED] Step 1: Describe your environment

• Xcode version: 13.4.1
• Firebase SDK version: 9.3.0
• Installation method: CocoaPods
• Firebase Component: Functions
• Target platform(s): iOS

[REQUIRED] Step 2: Describe the problem

Functions that throw already-exists generate the right HTTP response (seen in Postman as HTTP 409 Conflict). However, in the iOS client bubbles the error to the client as notFound. The commit mentioned below shows the affected areas and includes a fix.

Steps to reproduce:

Simple. Just throw the following from a Cloud Function:

throw new functions.https.HttpsError('already-exists', 'Resource exists')

If you have a downloadable sample project that reproduces the bug you're reporting, you will
likely receive a faster response on your issue.

Relevant Code:

https://github.com/firebase/firebase-ios-sdk/commit/3e758246f6c25001cb9f36ac9b429101a59219c7