The custom role was given more permissions than the cloudadmin role. Cloudadmin is the highest permissions that are provided in VMware Cloud, and any permissions that are added which are not part of the cloudadmin permissions (CloudAdmin Privileges (vmware.com)) will lock up the role and not allow any changes to be made.
Confirm if the role is able to be edited or removed using the [email protected] credentials. If the role is unable to be changed using cloudadmin, file a Support Request (Creating and managing Broadcom support cases) with VMware Cloud Global Support with a screenshot of the error and the custom role that was created.