ESM cannot include more than 100 users in an instance by name

ESM cannot include more than 100 users in an instance by name

I have created an instance other than the default instance and was trying to include specific users (which was not feasible by specifying department or site) for the newly created instance. But the system does not allow including more than 100 users. Could you please guide me on how to satisfy this need?

                  New to ADSelfService Plus?