This comes up a lot and people always panic last minute.
From what I’ve seen, middle names or initials usually don’t matter for cruises as long as your first and last name match your passport. Most systems don’t even include middle names consistently.
Airlines can be stricter, but cruise lines tend to be more relaxed about it.
I probably wouldn’t stress too much, but if it’s easy to fix for peace of mind, no harm either.
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