Add the OAuth Application User field on the OAuth Entity form to use the Client Credentials grant type for OAuth inbound integrations.
Procedure
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Open the OAuth client record that was created.
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Select more options icon on the page header.
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Select .
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On the Form Design page, add OAuth Application User from the list of fields.
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Save or Update the form.
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Select the user for the OAuth Application User.
For example, System Administrator.

Note: You must use the REST API Auth Scope with client credentials grant type to control the access provided to the 3rd party client.
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Save or Update the form.
Any authorization request with the Grant Type as Client Credentials, Client ID, and Secret is passed for the associated OAuth
Application User in ServiceNow®.
Note: If the OAuth Application User isn’t selected on the OAuth client record or the Client Credentials property is set to false, then the authorization request isn’t passed.