Our clan (Reapers on EU Void server) were promoted to Immortal this week (as allies), and now a large majority of members can no longer gain contributions from doing accursed towers.
On entering the tower, they (and I) receive the following message:
“You have left a Clan this week so your contribution scores will not count for your current Clan until next week.”
To be clear - the members have NOT left the clan, it’s a well established clan; The only change is the clan becoming immos.