Hi there! It sounds like you're having trouble using the SUBTOTAL function to count the number of visible rows after applying an autofilter. Here are a few things you can try to troubleshoot the issue:

1. Make sure that the autofilter is actually applied to the range you're trying to count. You can check this by clicking on the dropdown arrow in one of the column headers and seeing if the filter options appear.
2. Double-check that you're using the correct function number for counting visible rows. The number 2 should work for this purpose, but you can also try using 3 or 9 to see if that makes a difference.
3. Check that there are no hidden rows in the range you're trying to count. Hidden rows won't be included in the count even if they meet the filter criteria.
4. Try using a different range to see if the function works in a different context. For example, you could try counting the number of visible rows in a different worksheet or workbook to see if the issue is specific to your current file.

I hope one of these suggestions helps you get the SUBTOTAL function working as expected! Let me know if you have any other questions or if there's anything else I can help with.