You're trying to do the initial setup of Cloud Transport Management. At step 6 (Add Service Plan) on the page https://help.sap.com/docs/TRANSPORT_MANAGEMENT_SERVICE/7f7160ec0d8546c6b3eab72fb5ad6fd8/13894bed9e2d4b25aa34d03d002707f9.html, the Entitlement called Cloud Transport Management service is completely or partially missing for your subaccount.
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SAP Cloud ALM licence package, Application plan, service instance, cTMS , KBA , BC-NEO-CIS-OPS , Operation Requests related to CIS , BC-CP-LCM-TMS , SAP Cloud Transport Management service , How To
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