[BUG] RSO Login Fails for Some Users After They Click "Authorize"

[serkanbal]

Bug Description
In the last 2 weeks, we received a considerable amount of reports that users' RSO logins fail. The issue occurs for first time users. When they try to log in to our application, they enter their credentials and are presented the following permissions screen.

The users state that when they click on "Authorize" they get the following message: "An error occurred. The permissions are incorrect." (The error message is a translation from Korean, so it might not match the actual error message 100%, but should give the idea.)

All of our reports came from the KR region; so this issue might be specific to this region. However, our app has a large community in South Korea, so please take this info with a grain of salt.
Here is the Riot ID of a user that had this issue from the KR region:

• playaboiodong#0124

And since it might be related, here is our authorization URL: https://auth.riotgames.com/authorize?client_id=spikestats&redirect_uri=https://spikestatsapp.com/oauth-login&response_type=code&scope=openid+offline_access

Expected Result
We expect all of our users with a valid Riot Games account to log in without any issues.

Actual Result
Some of our users fail to log in to our app because of the issue explained above.

Developer Impact

• Frequency: Rarely.
• Severity: When it happens, users are unable to log in to our application. This reduces user satisfaction.
• Cost: Does not affect costs.
• Efficiency: Does not affect efficiency.
• User emails: We started getting complaint emails and 1-star reviews for our application.

Player Impact

• Frequency: If the issue occurs for a player, it is persistent for that player.
• Severity: Completely prevents user from logging in to our app.
• Quantity: Unknown at the moment.
• Region: So far we have seen this issue only for KR users as explained above.

Repro Steps

We were unable to reproduce this issue, however provided the Riot ID of a user troubled by this issue above.

[norhu1130]

We provide services for Korean users, and we are experiencing the same problem.