0hikalkan createdSupport Team
Did you run the
.DbMigratorapplication to create the database? It has a seed code to create clients for the auhentication (your error says "invalid_client"). If this doesn't solve the problem, please also share logs in the server side (inside the Logs folder of the application). Also, are you using separated identity server configuration (you can share screenshot of your solution structure in Visual Studio)?