[firebase_auth/unknown] Please register custom URL scheme ‘app’

This is a common error Flutter iOS set up with firebase. To overcome this issue make sure you redownload the GoogleService-Info.plist file from firebase console and put in Runner folders inside iOS.

In the file you will see REVERSED_CLIENT_ID copy that line and put the line inside info.plist file

So put your REVERSED_CLIENT_ID like that.

	<key>CFBundleURLTypes</key>
	<array>
		<dict>
			<key>CFBundleTypeRole</key>
			<string>Editor</string>
			<key>CFBundleURLSchemes</key>
			<array>
				<string>com.googleusercontent.apps.1057984911405-fg5dge90ofbfrs3tv0l72u08lunsk4ud</string>
			</array>
		</dict>
	</array>
	<key>CFBundleVersion</key>