As I understand, you have provided the debug SHA1 in the developer console,
then you signed the apk and the SHA1 changed.
If this is the case try the following you should obtain the release SHA1 from the keystore and replace the old SHA with that.
1. Open terminal and change the directory to JDK bin directory. Include your installed JDK version inside the path, for me it was – jdk1.8.0_101
(type javac -version
to get the Java version) :
Mac
cd /Library/Java/JavaVirtualMachines/<your_JDK_version>.jdk/Contents/Home/bin
Windows
cd C:\Program Files\Java\your_JDK_version\bin
2. Use keytool
to obtain the release SHA1 :
keytool -list -v -keystore <keystore_name> -alias <alias_name>
3. Go to your project’s credentials page and replace the SHA1 to your keystore’s release SHA1.