I’m using firebase authentication using phone number. I have added my number for testing which works fine and even I can see captcha verifier for same. But if I try with another phone number I’m getting error below

I am facing an issue in flutter application while creating user using firebase db. The user successfully created in authentication in firebase, but not in firestore.

The following is my event which get called when tapped on send code button after entering phone number

I chose the phone verification method for my app, I have added my sha-1 and sha-256 fingerprints. However, when I click on send otp, the terminal of my vs code says that they could not generate the otp. Why is this error occurring ?
Pls help, I have been trying to solve this issue for past three days.