Question: I was testing my login/sign up feature and for some reason I can't understand Firebase now is blocking all requests from my device.

I've waited one day to try again, but I still have the same problem.

> 
> ERROR:
>  "We have blocked all requests from this device due to unusual activity. Try again later."
> 
> 
> 

What should I do to have access to my database again?

Answer: 
I've run into the same problem.

By default (for the free plan), firebase caps sign-ins to 100 per hour, per IP-address.
This broke our automated testing. You can change the setting like this:

* open console
* open your project
* go to "authentication"
* go to "sign-in method"
* scroll down to "manage sign-in quota"

That's it. Currently the maximum setting for this quota is 1000 per hour
[![enter image description here](https://i.stack.imgur.com/yRnRh.png)](https://i.stack.imgur.com/yRnRh.png).
One of the causes can be sending too may verification email to a user's email within a short duration of time. Try adding a duration timer and check if the verification message has been sent within the time duration.