Newly Created Firebase Functions Throwing UNAUTHENTICATED Error - firebase

Question

I have a Firebase project with over 10 cloud functions. Today I added 3 more, but all three of the new ones are throwing an error UNAUTHENTICATED without actually trying to hit the function. (There's no record of a function call in the logs). I haven't made any changes to my environment or Firebase project since adding the previous functions.
I have tried redeploying all of the functions in my project, the three newest ones continue to fail while the previous ones work fine. I have also verified that I am using Node 8, since there are some similar issues reported stemming from using Node 10. I am not sure what else to try since the issue only applies to the new functions.
The new functions all have a similar signature:
exports.createGroup = functions.https.onCall((data, context) => {
//Firestore access
});
They are being called like this:
const create = functions().httpsCallable('createGroup');
return create({ group: oGroup }).then(result => {
//Do something
}).catch(err => {
console.log(err.message); //UNAUTHENTICATED
});
Node Version: 8.16.2
Firebase Tools Version: 7.6.1

Answer 1

2023 UPDATE
1. Go to the Google Cloud Console:
2. Click the checkbox next to the function to which you want to grant
access.
3. Click Permissions at the top of the screen. The Permissions panel
opens.
4. Click Add principal.
5. In the New principals field, type allUsers
6. Select the role Cloud Functions > Cloud Functions Invoker from the
Select a role drop-down menu.
7. Click Save.

Answer 2

It must be solved at your GCP Console (not Firebase). Just follow these steps:
Go to your GCP Console and login
On the top menu, select the corresponding Firebase project
On the left menu go to Cloud Functions Click the checkbox of your function (not the name of the function)
Once selected, on the right menu select "Add member"
On "New member" type allUsers
On the Select function bar, select Cloud Functions -> Cloud functions invoker
Click on "Save" and then "Allow public access" on the pop-up warning
And you're good to go!

Answer 3

Via Google Cloud docs:
As of January 15, 2020, HTTP functions require authentication by
default. You can specify whether a function allows unauthenticated
invocation at or after deployment.
The solution was to utilize the Google Cloud console (NOT the Firebase console) to add the allUsers permission to the newly created functions.
https://cloud.google.com/functions/docs/securing/managing-access-iam#allowing_unauthenticated_function_invocation

Answer 4

I ran into this error when deploying several functions and there was an issue during the upload where it seems the deployment got corrupted .. perhaps network related, not sure
After deleting the offending cloud functions in the Firebase console, and then doing a fresh successful deploy for them, the "FirebaseFunctionsException UNAUTHENTICATED" error went away
First I tried to just redeploy the functions, but that was not enough, the error continued this way

Answer 5

From the documentation for 2nd gen Cloud Functions:
Go to the Google Cloud console
Click the linked name of the function to which you want to grant access.
Click the Powered By Cloud Run link in the top right corner of the Function details overview page.
Click Trigger and select Allow unauthenticated invocations.
Click Save.
Took me forever to find this after trying to add allUsers and getting "Principals of type allUsers and allAuthenticatedUsers cannot be added to this resource".