Heyo! This is a known issue and is currently being investigated. [url=https://www.bungie.net/en/Forum/Post/257103564/0/0](Here is a list of Known Issues.)[/url] Here’s what Bungie has written about it in their list of known problems:
[quote]• Some players may not receive progress on Crucible and Iron Banner quests and bounties.[/quote]
This includes the weekly Pinnacle engram pursuit. If you don’t receive progress for a match, try leaving matchmaking and re-entering. Hopefully it gets fixed soon!