Hi @tatiang, thanks for your reply.
I have set my authentication up the same way as you. See bleow:
I was wondering if there is an expiry date of some sort for the Sign In Authentication in Firebase. I am using the “Spark” tariff (the free one!). Could this be the reason?
Andos?
I don’t think there is. I’ve been using Firebase for over a year and never gotten an error. And I haven’t paid anything for the account. 
Hi @tatiang, it’s looking like the issue maybe an API issue then because my Login was working perfectly fine one day and then the next day it wasn’t.
Once I had set up and working, I never interfered with it. So, as you suggested, I’ll need to contact Firebase and see if they can resolve this.
If the issue is found to be with Firebase, I shall let you know my findings.
This will now be after the festive season.
Andos.
Hi @tatiang, I hope you had a good festive. I went to the “help section” in Firebase and found the following.
Here is the link: Firebase Status Dashboard
I don’t actually understand what it means but I suspect it is relevant to my problem. I do not know what to do with this information. How do I respond to this? and What action should I take? I cannot find a way into a forum and when I try to search for my issue in the Help Centre no results are produced no matter how I ask my questions.
Andos.
Hi @tatiang, my problem has now been resolved.
I have now found the error. For some reason during the Thunkable Authentication issue, I had changed the API key in an attempt to fix the problem. I had used the API for my GoogleMaps instead. (Doh!).
I simply replaced it with the correct Firebase API key and now everything works again!! 
Thanks for all your help and patience
Many, many thanks,
Andos.
I’m so glad to hear that!
