Support for OAuth Realtime API for client

Hi, I'm building an Qt/QML interface to Rocket.Chat, called Ruqola. Password login works fine but now we're planning to have OAuth supoort. When used this, it gave this error-
{""errorType":"Meteor.Error",
"message":https://rocket.chat/docs/developer-guides/realtime-api/method-calls/login#using-authentication-providers [145546287]",
"reason":"No matching login attempt found"},
"id":"1",
"msg":"result"}
On the Rocket.Chat support channel, a team member said this is currently unavailable and that you won't support OAuth login via realtime API. Can you suggest any other way to implement OAuth in our client?