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If it's the HG700 or HG800 cassette it will have a little spacer to fit 11 speed hubs - without this it will be loose.
Shown in the last picture in this article.
https://cyclingtips.com/2018/03/shimano-ultegra-hg-800-11-34t-cassette-review/
lcf01
Yes! It's 11-34.