showing this error on facebook console Error found while validating app-ads.txt. com.abc.appname We couldn't find your developer website URL in your app's store listing. Learn more
my code working on emulator correctly but not working on real device i already add hash generated by flutter
keytool -exportcert -alias releasebuild -keystore H:/dart/Office/project/android/app/uploadkeystore.jks | C:\openssl\bin\openssl.exe sha1 -binary | C:\openssl\bin\openssl.exe base64
but it make hash key of 28 character but no ending with = sign