According to Bungie Help, you must have the materials on your character in order to exchange materials with the Speaker. If you do not have the materials on your character, the exchanges will not appear at the Speaker.
[b][url=https://www.bungie.net/en/Help/Article/12929]The Speaker is not exchanging materials for me.[/url][/b]
As for Eris, you need to be Eris Rank 4 on that character to exchange Radiant materials with Eris.
I hope that helps you!
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Thanks TravisSch I'm certain that I had quite a few Radiant Shards on my character after just completing Crotas End but I will be certain to check again.