Resolved: I face with "File not found!" error.
It seems that system is down. First I faced some problems related to files (File not found error). Now the course 'Introduction to Excel' which I was trying to finish, disappeared completely.
I faced the same problem. I finished the course and cannot see any sign for completion or certification about that.
We believe the issue is now fixed. Could you please let us know if you're still experiencing some technical difficulties?
The 365 Team