What you need to do is to bring the materials that you want to exchange with, like Ascendant Shards/Energy, Mote of Light, Radiant Shards/Energy. Strange Coins. The exchange feature will only show up when you have the exchange items.
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Bam! This is what you need. [url]https://www.bungie.net/7_The-Speaker-is-not-exchanging-materials-for-me/en/Help/Article/12929[/url]