Hello there, Thank you very much for reaching out to us. I'm sorry to hear that you are having issues with the event challenges. We've received reports of this issue and are investigating the underlying issue further. For any updates on this issue, we recommend viewing our Patch Notes as they become available, posted on the [url=https://www.bungie.net/7/en/News]News page[/url]. In the meantime, for the Full Spend challenge, you should be able to make progress in the challenge by purchasing the engrams available, and not the direct weapon rewards.