Those are all still matchmade activities, so while your're good to connect to us, it sounds like you may not be able to connect to others.
I'd recommend going through and ensuring your network is optimized, we have an article here that may help-
http://www.bungie.net/en/Help/Article/11931
Thanks for reaching out!
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I've tried all this, to no avail.
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Got it. I'll document your case for the team. We're always making changes to the parameters for matchmaking, so that more guardians can connect. Thanks for giving us more info!