Have reset phone to factory settings - it resynched everything except the golf course
I do not know how it works with golf courses, but at navigation courses, you have to use the button "Send to device" on the page Courses, so I'd tell it could be similar with golf courses too.
Thanks for the post, appreciate it , however doesn't appear as an option for the downloaded courses in the connect app
Try this: Troubleshooting Golf Courses That Will Not Download From the Garmin Connect App