Unable to create group instances

I have an issue with the group feature. A number of members and myself are unable to create group instances despite having the necessary permissions to do it (I am the owner of this group). This affects both the game and the website but seems to work using third party apps such as VRCX. It doesn’t seem to affect our ability to create group instance of other groups, just ours.
Thank you very much for your attention.

Group name : Exploreurs Imaginaires
ID : EXPLOR.5330