Firebase phone number authentication is not working

Hello friends,

I am using this plugin ionic cordova plugin add it is working before releasing of unsigned apk and its not working when we verify jar signer and showing this error

WARNING: META-INF/gradle-plugins/ not protected by si
gnature. Unauthorized modifications to this JAR entry will not be detected. Delete or move the
 entry outside of META-INF/.

Can anyone please help me?

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