What you were expecting to happen, and what actually happened?
About 40 minutes ago my guild completed gems task for 10 gems. I still haven’t received a mail for those 10 gems. Got the daily reward mail normally, but still no guild task completed mail.
What are the steps to make it happen again?
Do you have any screenshots or video you want to share with us so we can see the problem? Attach them to your post! I can post the screen shot of the activity log where the quest was completed.