Grayscale provisioning flow fails with the following error visible in the Okta dashboard:

Automatic provisioning of user <username> to app Grayscale failed: Error while verifying if user <username> exists: Unauthorized. Errors reported by remote server: Authorization failure. The authorization header is invalid or missing

• Grayscale
• Provisioning
• Error

1. Go to Okta Admin Console and navigate to Applications > Applications > Grayscale > Provisioning > Integration > Edit.
2. Enter the Grayscale username and password credentials.
3. Click Test API Credentials, verify the connection was successful, and then click Save.
4. Attempt the failed tasks again. Navigate to Dashboard > Tasks. Any failed assignments should appear under Tasks. 
5. After locating the failed task for the user that should be retried, click on Retry Selected.

Related References

• Grayscale: Configuration Guide