Thank you for creating new topic as per mentioned in previous discussion. Other mentor has already responded you, so I suppose your issue is being addressed.
Remember even if you have passed the test, using an incorrect fuction than what metadata is being written will still counts for a grader failure.
Another reasons which I found with most learners were in moving avg forecast were most learners hard-coded the path,or used incorrect time series.
Next common errors were while writing codes for series, most of the learner tend to use len function which is incorrect for diff series rather one needs to define based on split time and correct time assign.
sharing a post comments where codes correction points are mentioned grade cell wise. if you still not able to find then share screenshot of your codes by personal DM only.
Regards
DP