Troop chat and notification errors

Message in troop chat that at least one of the troop members has not been assigned a room. However, all rooms are occupied and have already been swapped several times. Furthermore, there is a permanent red dot as a notification on the troop tile. Unfortunately, I cannot get rid of both errors. What can I do about it?

Device Type: Phone/Tablet
Device Model: iPhone/iPad
Device Operating System: iOS
Diablo Immortal App Version: Last Version

Had this issue over a year ago, quite annoying.

Ask members to check the remnant they use. I think it was caused by it when one got deleted and a players didn’t update after. Not certain as it disappeared randomly one day after telling people to check ALL their WB selections.