This is probably due to your fingerprint not being added to the android app on Firebase. Supply someone in the team that has Firebase access with your SHA-1.

Follow the following instructions to find your SHA1 key.

Note: You need to have Java installed.

• Run keytool -list -v -alias androiddebugkey -keystore ~/.android/debug.keystore
• Enter the default password android
• Copy Certificate fingerprint: SHA1: <YOUR SHA1>

• Navigate to the android folder situated inside the project folder. For example: cd C:\Users\Root\Documents\Development\projects\dibbs\android
• Run .\gradlew.bat signinReport
• Copy the SHA1: <YOUR SHA1> under debugUnitTest

Detailed instructions can be found here.

• Right click on start-button and open "System"
• Search for "Advanced system settings" and open it
• Click the button "Environment Variables ..."
• In System Variables, click "New..."
• New Variable Name: _JAVA_OPTIONS
• New Variable Value: -Xmx512M
• Click OK
• Restart Visual Studio, so the variable is picked up

For further reading see this Stackoverflow question

Run sudo xattr -d com.apple.quarantine /Users/kallejohansson/development/flutter/bin/cache/artifacts/usbmuxd/iproxy

Detailed instructions can be found here.

Go to About This Mac > Storage > Manage > Developer and delete everything there. Run this script. This is safe since everything that is needed will be recreated once you run the app again.