New Subscription or New History Snapshot produces error

SQL Server 2016 SP1 on Windows 10 Professional on a Dell Laptop

Report Manager (Web Portal URL) has reports embedded, folders etc. Report server; Report Manager and Report Builder 3 are all working.

Trying to create a New Subscription or New History Snapshot produces error. Report user is administrator of SQL Server 2016 SP1 as well as installer. The current user is also the Reporting Services Administrator. The report is neither a linked report not does it have parameters. Data Source credentials are that the report author who is also the current user as well as the server installer on the Windows 10 Pro laptop.

Here are the messages. Some MSDN content on MSDN site related to this subject is outdated and does not relate to some of the procedures mentioned in MSDN articles.

---

Jayaram Krishnaswamy