Don't know if you ever found a solution to this but I had the same issue.
I sorted it by going to 'Friends' in the top right of the site (bungie.net) then to 'PlayStation' and re-authenticating my account. Guess if you are on Xbox you'd go to 'Xbox LIVE' and do the same. Once I did that the clan leader was able to approve me to use the guild tags.
Hope is helps you or anyone else looking for an answer.
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hey just quickly, im having this issue im an admin for my clan, and someone has tried to join and every time i click on approve it gives me this msg "You cannot join this clan because you have not played Destiny using a linked PlayStation Network account.(657)"
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same here. Did you solve it?
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Hi Jaybfry Like I mentioned above, get them (personing joining) to check if their account needs re-authenticating. My clan leader was getting that error went trying to add me. It's a mis-leading error message for sure.
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still not working sadly.