Additionally Check the below KM document as well, as there is a known bug for Contracts Workcentor when accessed through Interation Hub.
E-PORTAL : Accessing Dashboard Links On Contracts Workcenter via iHub Gives Not Authorized Error (Doc ID 2480091.1)
Thanks for posting your query in Oracle Community.
Please Navigate to the People Tools -> Security -> Permissions and Roles-> Open the Role of the User -> Open the corresponding Permission List -> View Definition -> Edit Components -> Edit Pages-> Click on the required privileges for this Permission lists and Save.
Also, Please make sure that the User is having web library WEBLIB_PTAL linked with the Permission lists linked.