if isDN {
					// warn user that DNs are not allowed
					writeErrorResponseJSON(ctx, w, errorCodes.ToAPIErrWithErr(ErrAdminLDAPExpectedLoginName, err), r.URL)
				} else {
					writeErrorResponseJSON(ctx, w, errorCodes.ToAPIErrWithErr(ErrAdminNoSuchUser, err), r.URL)
				}
			}
			writeErrorResponseJSON(ctx, w, toAdminAPIErr(ctx, err), r.URL)
			return
		}
		opts.claims[ldapUser] = targetUser // DN