解决方法:https://github.com/laravel/passport/issues/221
In your oauth_clients table, do the values you have above exist exactly as you have them in your database?
oauth_clients
id - 3
secret - 3TfJGj4rrvOQvjZkI8dDqx78ouH99F2DuIMKHoKH
redirect - http://consumer.dev/callback
If it doesn\'t exist exactly like that in the database for passport.dev then it will throw the invalid_client error. Please be sure to check that and we will see if any further investigation is needed.
- 还需要查看 oauth_clients 表的 password_client 是否为 1