Sorry to hear about the trouble. Please sign out of the Adobe Creative Cloud Desktop app and then sign in back and please ensure that you are opting in for "Organisation Account" instead of "Personal Account" while signing in on the Creative Cloud Desktop App and then check if you are able to share the links. In case if it still doesn't work, please log a support case by following the steps shared here https://helpx.adobe.com/enterprise/using/support-and-expert-services.html
Sorry for the trouble in creating links in XD. If you are on an enterprise team license then I would request you to please create a case, or initiate a chat from the Admin Console's support tab if you're a System or Support administrator using this link: https://helpx.adobe.com/contact/enterprise-support.cc.html If not, then contact your admin and ask them to create a case or start chat through the admin console so that our Enterprise team can help you directly.
Let us know if you face trouble connecting with them.