If you encounter an error running pipelines init-github, ensure that you can view the GitHub Webhooks page for the repository by using the following procedure:
Sign in to GitHub.
Go to your repository, and then click Settings.
In the menu on the left side, click Webhooks.
If you cannot view the Webhooks page, you may not have the necessary permissions in GitHub. Contact your organization’s GitHub administrator for access.
Another possible cause is you may have used an incorrect GitHub personal access token. In GitHub, you can revoke your old personal access token, create a new one, and then try again to run pipelines init-github.
Note
After you fix any detected issues with any pipeline jobs, run the start command again to restart the build.
How can I fix GitHub issues in Pipelines? | Acquia Product Documentation