diff --git a/zerver/lib/actions.py b/zerver/lib/actions.py
index eda5f0d4dc..a490324f5a 100644
--- a/zerver/lib/actions.py
+++ b/zerver/lib/actions.py
@@ -2063,7 +2063,7 @@ def validate_user_access_to_subscribers_helper(user_profile: Optional[UserProfil
         raise ValidationError("Requesting user not in given realm")
 
     if user_profile.realm.is_zephyr_mirror_realm and not stream_dict["invite_only"]:
-        raise JsonableError(_("You cannot get subscribers for public streams in this realm"))
+        raise JsonableError(_("Subscriber data is not available for this stream"))
 
     if (stream_dict["invite_only"] and not check_user_subscribed()):
         raise JsonableError(_("Unable to retrieve subscribers for invite-only stream"))
diff --git a/zerver/tests/test_auth_backends.py b/zerver/tests/test_auth_backends.py
index e671ad06a5..f1e0416e47 100644
--- a/zerver/tests/test_auth_backends.py
+++ b/zerver/tests/test_auth_backends.py
@@ -1659,7 +1659,7 @@ class TestJWTLogin(ZulipTestCase):
             web_token = jwt.encode(payload, auth_key).decode('utf8')
             data = {'json_web_token': web_token}
             result = self.client_post('/accounts/login/jwt/', data)
-            self.assert_json_error_contains(result, "No realm specified in JSON web token claims", 400)
+            self.assert_json_error_contains(result, "No organization specified in JSON web token claims", 400)
 
     def test_login_failure_when_key_does_not_exist(self) -> None:
         data = {'json_web_token': 'not relevant'}
diff --git a/zerver/tests/test_users.py b/zerver/tests/test_users.py
index 2ec1bb6267..7de0024e5d 100644
--- a/zerver/tests/test_users.py
+++ b/zerver/tests/test_users.py
@@ -220,7 +220,7 @@ class AdminCreateUserTest(ZulipTestCase):
             short_name='Romeo',
         ))
         self.assert_json_error(result,
-                               "Email 'romeo@not-zulip.com' not allowed for realm 'zulip'")
+                               "Email 'romeo@not-zulip.com' not allowed in this organization")
 
         RealmDomain.objects.create(realm=get_realm('zulip'), domain='zulip.net')
 
diff --git a/zerver/views/auth.py b/zerver/views/auth.py
index cac5b6aef0..a1307a3b86 100644
--- a/zerver/views/auth.py
+++ b/zerver/views/auth.py
@@ -231,7 +231,7 @@ def remote_user_jwt(request: HttpRequest) -> HttpResponse:
         raise JsonableError(_("No user specified in JSON web token claims"))
     email_domain = payload.get('realm', None)
     if email_domain is None:
-        raise JsonableError(_("No realm specified in JSON web token claims"))
+        raise JsonableError(_("No organization specified in JSON web token claims"))
 
     email = "%s@%s" % (remote_user, email_domain)
 
diff --git a/zerver/views/users.py b/zerver/views/users.py
index 8245015a1b..57a90e8af9 100644
--- a/zerver/views/users.py
+++ b/zerver/views/users.py
@@ -453,8 +453,8 @@ def create_user_backend(request: HttpRequest, user_profile: UserProfile,
     # invited first.)
     realm = user_profile.realm
     if not email_allowed_for_realm(email, user_profile.realm):
-        return json_error(_("Email '%(email)s' not allowed for realm '%(realm)s'") %
-                          {'email': email, 'realm': realm.string_id})
+        return json_error(_("Email '%(email)s' not allowed in this organization") %
+                          {'email': email})
 
     try:
         get_user(email, user_profile.realm)