Common error between two IF function. First if already completed and you start second if with comma with would be concatenate operator like
=IF(ISBLANK(AK20),""," - "&AK20&" "&K19&" "&O19&" = "&AM20&"") & IF(ISBLANK(AK21),""," - "&AK21&" "&K19&" "&O19&" = "&AM21&"")
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