@doodle160: Use corresponding script from specific scripts bundle with proper key (both are available via my signature). If it will not work, tell what version of the game you're trying to extract.
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Script for decrypting Dragon Quest XI S saves. More info
here.
Update: Updated version of the script supports saves from microsoft store (game pass), steam and switch versions of DQ XI S - but there is no auto-detect feature, so you should edit script manually (I've added comments in it for that reason). Also, you can encrypt saves back with the same script, just open the script and edit it according to corresponding comment.
Please note that saves from different versions can be incompatible with each other due to differences in internal format, this script only allow you to decrypt and encrypt saves with different keys.
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You can request AES keys on
rin forums (the list with keys is also there)
AES keys finder and latest UE4 bms scripts:
in this post