So, to change the affinity on a piece of armor you must take off all the mods on that armor. But, with the lucky pants change giving it the hand cannon holster mod in an extra mod slot, I can't change the affinity because I can't take that mod off.
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Hello, Thank you for your report, Bungie is aware and investigating this. Stay tuned to the TWaB and [url=https://twitter.com/BungieHelp]official Twitter[/url] for updates