Mercy's ultimate ability allows her to revive dead teammates, but I've noticed it definitely has a range restriction.
How close do I need to be to a corpse before Resurrect will work on it?
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Ever since Mercy's rework in 2017, Resurrect is now a single target ability that, according to the patch notes, has a range of 5 meters.
The range is listed as 15 meters on the patch notes from Feb 9. Couldn't find an active post at battle.net, so here is a gosugamers link
Here is reddit post to give you a better idea of what a meter means in the game https://www.reddit.com/r/Overwatch/comments/48axy7/hero_ability_ranges/