On playstation you can send a message with the invite. You can also cut and paste text that you've written, so there is absolutely no reason why someone can't send an invite with a message that says "Crota's End: Normal" or something like that. People just don't do that, they just spam invites.
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That sure makes it a lot easier for you. Not me......... :(
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Don't feel too bad, most people don't actually send a message..... regardless of how easy it is.