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Many reader apps default to the readers style unless you can set Use Publishers" style. Even then, that may be limited.
Consider (which your code did) using underline or Bold (to Emphasize) as that also works in B&W.
The other question: Did you embed a Bold Italic version of the type face (and make the appropriate CSS @fontface entry You may need al 4 font versions)?
The viewers in Sigil and Calibre tolerate a lot of stuff that devices toss as bad.
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