It is a known bug.
It happens when you are done with the weekly powerful reward.
They have nothing to give you.
Unless you forgot to pick up some upgrade materials from them.
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Thanks for the reply! Didn't know there was a known bug so thanks for that! Elsie's been flashing for me for ages (probably since the Europa expansion) For Eris I've just noticed it's because I never finished the last fireteam memory for her (oops) Thanks again