VK provider not working

Provider type

Vk

Environment

  System:
    OS: Windows 10 10.0.19045
    CPU: (12) x64 AMD Ryzen 5 2600 Six-Core Processor
    Memory: 5.75 GB / 15.93 GB
  Binaries:
    Node: 20.11.0 - C:\Program Files\nodejs\node.EXE
    npm: 10.2.4 - C:\Program Files\nodejs\npm.CMD
    pnpm: 8.15.6 - C:\Program Files\nodejs\pnpm.CMD
  Browsers:
    Edge: Spartan (44.19041.3570.0), Chromium (127.0.2651.74)
    Internet Explorer: 11.0.19041.3570
  npmPackages:
    @auth/prisma-adapter: ^2.4.2 => 2.4.2
    next: 14.2.5 => 14.2.5
    next-auth: ^5.0.0-beta.20 => 5.0.0-beta.20
    react: ^18 => 18.3.1

Reproduction URL

https://github.com/degibons/authjs-vk-issue

Describe the issue

When trying to sign in through a VK provider, an error is displayed
{"error":"invalid_request","error_description":"Code challenge method is unsupported"}

How to reproduce

• Clone the repository from Reproduction URL and run npm install
• Create and setup vk app https://id.vk.com/about/business/go
• Create .env file from .env.example
• Fill AUTH_VK_ID, AUTH_VK_SECRET variables from created vk app
• Run docker db container npm run db
• Push db schema npx prisma db push
• Run dev app npm run dev
• Go to localhost and click the button "SignIn"

Expected behavior

Normal sign in flow without this error.

Start with the linked reproduction repository, its .env.example, and the VK provider setup. Run the documented npm and database commands, then reproduce the sign-in flow from localhost and inspect where the VK authorization request is configured. Done means the flow completes without the “Code challenge method is unsupported” error.