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Was there some XEM limit for Opt-in accounts? E.g. if the account had too few XEMs, then for it is not created the XYM-account?
(Before the snapshot I moved most of account's XEMs away, coz had unidentified problems with Win10 and the XYM-wallet)
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I hope You didn't move Your xem before the snapshot happened? It needed to be in Your opt-in account at the time of the snapshot! I think the minimum was 100 xem, so if You didn't have at least 100, the account was not recorded in the snapshot.
Moved to Exchange, which was in the list of 'XYM-snapshot supported'. So, I expect to get the XYMs ...