Our iOS app only makes calls over https and nothing else, so we have to submit our self classification report. We filled out every field, but we don\'t know if the ECCN is 5D002
In most cases, as the other answer, an APP for general use, available in the store has likely ECCN 5D992
and is of type MMKT
(Mass Market).
In case your app uses different and/or specific encryption technology (e.g. a VPN app, your own encryption libraries and so on) you might need a different classification.
As there are some references to this question I thought I added some links for the subject:
Apple store connect information
Blog with example
Another blog with example
Actual US site on the ASCR
Be aware that you need to check yourself if all information is correct before you submit it.
Practical note: depending on your settings in Excel, your csv might not actually be using a 'comma' when you save it as a csv. Check that before you send it in!