Discord OAuth error OAuthCallback

Hey, this feels like a noob question but I've searched for related issues and not been able to solve it I'm trying to sign into discord on production - I'm able to do this just fine running on dev against http://localhost:3000 I've created a separate app in the discord developer portal for prod against https://www.mywebsite.example/api/auth/callback/discord and get as far as the attached image, but clicking Authorise just takes me back to the 'Try signing in with a different account' error message