- Git with credential manager
- Do not add GitHub account to SourceTree
- Create new token in https://github.com/settings/tokens
- Select "repo" scope
- Create token and copy it to clipboard
- Click SSO icon in created token and authorize company account
- Clone private company repository in command line
- Use your generated personal access token as a password. This saves credentials to Git credential manager.
- Start using SourceTree normally
Thanks ;)