The Cortana Beta in 2004 is causing various hassles, They promise more updates to fix this. Eventually.
In the meantime read the thread here: https://answers.microsoft.com/en-us/windows/forum/all/using-cortana-in-2004-version-of-windows-10/ee6baf79-134a-4fe0-b00e-78cf731842b1
Go to your Windows App Store and check for updates, that's where Cortana updated for me!