yahoo oauth and oauth2.0 login malfunction

Question

Users access our website using Yahoo OAuth 1.0,but it failed and have the below behavior.

1.redirect to https://api.login.yahoo.com/oauth/v2/request_auth?oauth_token=XXXX

2.Login page is shown, type in login name

3.Type in password

4.After loading for a while... It will go back to Login page in Step 2
Repeat Step 2-3

It was definitely working before without the above bug

Then update our system use Yahoo OAuth 2.0 when we request https://api.login.yahoo.com/oauth2/get_token but sesponse not include 'xoauth_yahoo_guid' field :

{
    "access_token": "XXXXXXXXX",
    "refresh_token": "XXXXXXXXXXXXX",
    "expires_in": 3600,
    "token_type": "bearer"
}

anybody else is experiencing the same bug and/or know how to fix this?

Answer 1

Tested on 31 Aug 2018,

The Yahoo OAuth 2 login flow is working again, probably Yahoo team fixing their bug.

Also reference this: Yahoo OAuth 2.0 login malfunction