Universal Containers (CU) has been using Salesforce to manage its sales and service processes. UC also an Experience Cloud site to interact with its customers. UC has now acquired Cloud Kicks (CK) Retail to grow its business, CK also uses Salesforce and a self-service site built on the experience Cloud to allow its customers to log support requests. UC now wants its customers to be able to use CK's self-service site so they can have a more integrated experience.
What should an Experience Cloud consultant recommend so that UC's can log in to CK;s site?