This is a known issue with the latest patch of the game - see the Known Issues section of the patch notes - [RELEASE] Release Notes (1.14.5.0) Sim Update III Now Available!
Personally I’d consider broken training missions a release breaking bug, but MS/Asobo have a different QA standard that I can only describe as “Ship It!”
Also their Copy/Paste keys must be broken as well because even though this was a known issue in the patch release notes, it’s not on the ZenDesk Known Issues page. It’s not like having clear and consistent information is important or anything…