Firebase custom auth error: used custom token to login

For generation of custom token is used io.jsonwebtoken:jjwt:0.6.0

Map<String, Object> claims = new LinkedHashMap<>();
    claims.put("iss", "");
    claims.put("sub", UUID.randomUUID().toString());
    claims.put("aud", "firebase_email_address");
    claims.put("uid", UUID.randomUUID().toString());

Optional<String> customToken = Optional.of(Jwts.builder()
        .setClaims(claims)
        .signWith(SignatureAlgorithm.RS256, service_account_private_key)
        .compact());

Description in documentation:
If your backend is in a language that doesn't have an official Firebase Admin SDK, you can still manually create custom tokens. Find a third-party JWT library for your language [enter link description here][1].


But when try client to log in with this token:

firebaseAuth.signInWithCustomToken(response.data.token).then(function (success) {
                  console.log('Login Success!', success);
                }, function (error) {
                  console.error('Error ' , error);
                });

this error is received:
Error in console

Source: AngularJS

from Angular Questions https://angularquestions.com/2017/10/05/firebase-custom-auth-error-used-custom-token-to-login/
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