After updating from 10.7.2 to 11.4.0 we are unable to create or delete communities. For creation after clicking Finish nothing happens. For deletion we get an error message "Update failed" when saving the changed realm settings.
There is a limitation of 50 communities that can be created, no more that that, refer to DTS :174968 and 174967
It is recommended to create a new Realm and create more communities, this will also be good for performance.
Please contact Technical support for further assistance.
Note: The limit of 50 communities can be overcome with CEM value. We support only 50 communities for Realms.