Do you have the license for IT service intelligence,. ITSI is considered as the premium app for Splunk and without license you wont be able to use. Try to check with your account manager and Splunk account manager so they can convert you enterprise license to entity license, where you have right to access. Also If you have ES installed in the search head where you have installed ITSI, it wont work. ES will require dedicated search head to use and ITSI too required dedicated search head to run. Both the premium app cant be run on a single search head.
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