Can you use the same Firebase auth for 2 different projects? - firebase

I have two projects and I want to link them together.
I have auth set up on one of the projects and I want people from the other projects to log in to the same auth accounts.
Is that possible? If it is, can you explain how?
Thank you!

You should be able to do so. In your Firebase project, go to project settings, add a new app [android\iOS\web\unity] to your existing app.
Download the new google services.json and add it to your project.
Should work fine.

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Anyone who has any experience with this please let me know. Thanks.

Create multiple different apps with the same firebase realtime database

I want to create two different apps that access the same firebase project. So, is the approach the same for both apps? As in I get the configuration and initialize firebase, or is there more to it?
Both projects are being done in react native with expo if that matters.
Thank you!
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Today I discovered that it is not possible to change region in firebase project once it has been created.
When I initially created my project it was set up to use us multiregion option and I now need to move it to a single region instance in europe.
It seems that only option here is to create new firebase project in that region and migrate the data.
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I've searched for a while all over to see if there is a way to register an app with Firebase via an API but cannot seem to find anything on the topic.
is it possible to register a bundle id with Firebase and then download the corresponding google-services.json and google-services.plist files?
I'm working on automating a repetitive process that I have to do.
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Try to use by anyway SMB protocol.

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