Sanctum of Domination Mythic Raid not in Instance Group Bug

I got invited to a Sanctum of Domination Mythic Raid this week for the Collector’s Bounty. I accepted the lockout instance since they already killed 1 boss. After accepting it, the “you are not in this instance group and you’ll be teleported to the nearest graveyard in 1 minute” appeared. All of us were getting the same warning and I assume except for the raid leader. I tried multiple times to go in but it still saying the same thing. I am now lockout to a bugged instance and can’t join any other SoD Mythic Raid because of this.