Admins may receive an error Incorrect credentials, please verify and try again while trying to enable API Integration for the GitHub.com application in Okta, and do not receive a consent screen on GitHub to authorize Okta to access resources, as mentioned in Step 5 of the Provisioning document. 

• GitHub.com Provisioning
• Okta Integration Network (OIN)

1. Navigate to the user setting in GitHub.
2. Click on Applications > Authorized OAuth Apps > Okta SCIM Integration.
3. Enable the option next to the organization's name.

Related References

• Configuring SAML single sign-on and SCIM using Okta