When we try to submit a Cloud Catalog item, we see an error "User or Group Quota exceeded" and we are unable to submit the Catalog Item.
Release or Environment
1. If the userGroup variable is defined as a reference field instead of Lookup Select Box, the UserGroup will be passed as sys_id instead of the String in the RuntimeMap.
2. However, We expect the UserGroup to be passed as a string.
1. Change the type for the UserGroup variable from reference to Lookup Select Box in the Cloud Catalog Item.
There is another cause for the error "User or Group Quota exceeded" which is explained in the below KB article :