Legendary gem wasn’t added to inventory

I completed a rift and it said I got a leviathan tomb but it wasn’t added to my inventory after I exited the rift- also wasn’t added by mail. Not sure if it’s because I already had one equipped and another already in my inventory ( see this would have been my third)

Device Type: iPad Pro
Device Model:
Device Operating System: iOS
Diablo Immortal App Version: