# Invalid API key error when sign in / sign up

**URL:** <https://community.thunkable.com/t/invalid-api-key-error-when-sign-in-sign-up/1548260>\
**Category:** Questions about Thunkable X\
**Tags:** firebase, login, help, auth\
**Created:** [October 7, 2021, 2:37am UTC](https://community.thunkable.com/t/invalid-api-key-error-when-sign-in-sign-up/1548260 "2021-10-07T02:37:24Z")\
**Posts on this page:** 1\
**Showing post:** 8

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**Author:** ![muneer](https://sea1.discourse-cdn.com/flex015/user_avatar/community.thunkable.com/muneer/32/75210_2.png) [@muneer](https://community.thunkable.com/u/muneer)\
**Post date:** [October 7, 2021, 7:43am UTC](https://community.thunkable.com/t/invalid-api-key-error-when-sign-in-sign-up/1548260/8 "2021-10-07T07:43:46Z")

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I tested your app using my API key and Database URL and it is working.

One thing that worth noticing. Would you say that this situation applies to you?

> [@Firebase Realtime database not working when you choose Europe datacenter](https://community.thunkable.com/t/firebase-realtime-database-not-working-when-you-choose-europe-datacenter/1280376):
>
> Hello Guys, My small contribution to this wonderfull communitiy. I was creating my project and trying to connect with Firebase Realtime database without success. The bug is simple : Do not chose server location in Europe when you create your DB Cheers

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