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I have a workbook of 400 contacts that has 12 columns of different marketing preferences. These fields are option sets.
I exported the 400 contacts, saved that file as the original xml, created a duplicate to work in, edited all of the fields in Excel and then copied all of the values over back into the original to be imported.
The import runs fine and returns 400 successes but when I go into the contacts the fields are not actually filled out, there doesn't seem to be a pattern to which field on which contact stays unfilled or why.
You need to import back the original file after making changes in it.
if you check, the original file will have hidden columns which are GUID of the records you want to update; it helps the system to identify uniqueness.
Check those file has contact guid if not then from the original xml enable those hidden contact guid field and duplicate it back and also check optionset values are properly given
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