Issue:
Not able to edit a newly added LDAP user's group affiliations via the users section of SCH.
Solution:
This is not something that can be managed via SCH due to the nature of the SCH-LDAP integration in an on-prem installation. Please refer the following documentation sections for more details.
When using LDAP, we assume that the user wants to use LDAP as a central place for keeping groups across the organization and all the different applications. Hence, we don't allow such changes in SCH as that would break the idea of a centralized group management.