If you are thinking of Ceramic or porcelain tile the quick answer is NO!!
The moisture in the adhesive/thin set will likely make the wallpaper release at the worst possible time. It needs to come off & the substrate needs roughed up a bit to give the thin set something to mechanically bond to.
If this is a wet area like a shower or tub surround DRYWALL is a NO NO too, should be green board.
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