Steps to reproduce:

# docker-compose.yml
version: '3'
services:
    jenkins:
        image: jenkins/jenkins:2.277
        ports:
            - 8080:8080

$ docker-compose up

• Unlock Jenkins
• Install suggested plugins
• Create a user
• Manage Jenkins > Manage Credentials > (Jenkins/global) Add credentials
  • Kind: Username with password
  • Scope: System
  • Username: (email)
  • Password: (password)
• Manage Jenkins > Configure System > GitHub > Advanced... > Manage additional GitHub actions > Convert login and password to token
• From credentials
  • Choose the created credentials
  • Create token credentials

Output:

Can't create GH token - https://api.github.com/authorizations {"message":"Not Found","documentation_url":"https://docs.github.com/rest"}

• From login and password
  • Login: (email)
  • Password: (password)

Output: same

Supposedly Jenkins uses GitHub API v2 or something deprecated.