SharePoint Online Spoke: Error Fetching Token - Key Not Found, Thumbprint of Key Used by Client - Support and Troubleshooting

SharePoint Online Spoke: Error Fetching Token - Key Not Found, Thumbprint of Key Used by Client Issue When fetching the token from the credentials record, you are getting the following error:

{"error":"invalid_client","error_description":"AADSTS700027: The certificate with identifier used to sign the client assertion is not registered on application. [Reason - The key was not found., Thumbprint of key used by client: 'xxxxxxxxxxx', Please visit the Azure Portal, Graph Explorer or directly use MS Graph to see configured keys for app Id 'xxxxxxxxx'. Review the documentation at https://docs.microsoft.com/en-us/graph/deployments to determine the corresponding service endpoint and https://docs.microsoft.com/en-us/graph/api/application-get?view=graph-rest-1.0&tabs=http to build a query request URL, such as ' https://graph.microsoft.com/beta/applications/xxxxxxxxxxxx ']. Trace ID: xxxxxxxx Correlation ID: xxxxxxxxxT imestamp: 2024-07-10 09:24:18Z","error_codes":[700027]

Cause Thumbprint is not encoded in Base64 format.

Resolution When configuring the Microsoft SharePoint Online connection record, follow these steps:

1. Copy the entire value of the Thumbprint from the Azure Portal. 2. Encode the Thumbprint value to a Base64 value using a Hexadecimal to Base64 (Hex to Base64) converter tool. 3. Record the Base64 value for later use.

Note: When creating connection records for the Microsoft SharePoint Online spoke in ServiceNow, ensure you use the Base64 value, not the Hexadecimal value, in the Attributes tab.