Earlier I was trying to run VoG guided games as a guide, no one in the fireteam could send a discord link for the person to join voice chat, nor could we communicate via text chat because both fireteam chat and game chat were not working.
The only work-around was to add the "seeker" as a friend in steam, and then send them a private message with the discord link.
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Steam issue, nothing to do with bungie. In game chat and voice is held through Steams backend.