This post has been answered. How do I find and message a player just by his player name and not his Bungie name? (on PC)
English
#Help
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Hello there[url=https://cdn.discordapp.com/attachments/902560216871239752/989591085506515074/Hellothere.gif],[/url] Bungie messages would require a Bungie name. If you have their platform info you can try messaging via the platform they played on.