I've setup react-native-twitter-signin package as like in documentation and works perfectly on Android. But I'm getting this error on iOS.
Possible Unhandled Promise Rejection (id: 1): Error: Twitter signin error.

Is it due to callback issue?
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The problem for me was the I didn't put
twitterkit-CONSUMER_KEY://in the Twitter developer site.Go to https://developer.twitter.com/en/apps/
Pick you app then press edit button on right side
Edit the details, and scroll to Callback URLs
Add twitterkit- (delete this and put your
CONSUMER_KEYinstead). It should look something like this: