The Double XP is activated automatically once earned. Nothing you do on your end.
For those members that appear in the APP but not the console.
1- these members need to be KICKED from the clan via APP.
2- this will be a case by case issue.
- Once kicked, pull that clan members profile in the APP ( do a search for player in the APP) Once you find them, scroll down on their profile and see if they belong to another clan. Odds are they have reverted back to another clan ( most likely a clan they created before your clan )
- now that person needs to leave that clan. Next to the HELMET looking icon on the app ( to the left of it ) there is an icon they can click to leave the clan. They need to leave that clan. In some cases, it will put them in an older clan they created before that. That person needs to repeat steps and leave that clan.
FYI - this member may show he does not belong to a clan even though he went back to an older clan after he leaves the first time. That's why I stated check his profile again. The App may take time to update this information. If his APP shows he does not belong to a clan but you check and see he does belong now to another clan, then have him close app and re open it. It takes time to update.
- Once that member does not belong to any clan ( check his profile and make sure he does not belong to any clan on APP ) then send an invite via console. Then he will appear in both APP and Console.