diff --git a/keyserver/src/creators/invite-link-creator.js b/keyserver/src/creators/invite-link-creator.js
index cdee8d86f..f7e52fa46 100644
--- a/keyserver/src/creators/invite-link-creator.js
+++ b/keyserver/src/creators/invite-link-creator.js
@@ -1,138 +1,142 @@
 // @flow
 
 import Filter from 'bad-words';
 
 import type {
   CreateOrUpdatePublicLinkRequest,
   InviteLink,
 } from 'lib/types/link-types.js';
 import { threadPermissions } from 'lib/types/thread-permission-types.js';
 import { ServerError } from 'lib/utils/errors.js';
+import { reservedUsernamesSet } from 'lib/utils/reserved-users.js';
 
 import createIDs from './id-creator.js';
 import {
   dbQuery,
   MYSQL_DUPLICATE_ENTRY_FOR_KEY_ERROR_CODE,
   SQL,
 } from '../database/database.js';
 import { fetchPrimaryInviteLinks } from '../fetchers/link-fetchers.js';
 import { fetchServerThreadInfos } from '../fetchers/thread-fetchers.js';
 import { checkThreadPermission } from '../fetchers/thread-permission-fetchers.js';
 import { Viewer } from '../session/viewer.js';
 
 const secretRegex = /^[a-zA-Z0-9]+$/;
 const badWordsFilter = new Filter();
 
 async function createOrUpdatePublicLink(
   viewer: Viewer,
   request: CreateOrUpdatePublicLinkRequest,
 ): Promise<InviteLink> {
   if (!secretRegex.test(request.name)) {
     throw new ServerError('invalid_characters');
   }
   if (badWordsFilter.isProfane(request.name)) {
     throw new ServerError('offensive_words');
   }
+  if (reservedUsernamesSet.has(request.name)) {
+    throw new ServerError('link_reserved');
+  }
 
   const permissionPromise = checkThreadPermission(
     viewer,
     request.communityID,
     threadPermissions.MANAGE_INVITE_LINKS,
   );
   const existingPrimaryLinksPromise = fetchPrimaryInviteLinks(viewer);
   const fetchThreadInfoPromise = fetchServerThreadInfos({
     threadID: request.communityID,
   });
   const [hasPermission, existingPrimaryLinks, { threadInfos }] =
     await Promise.all([
       permissionPromise,
       existingPrimaryLinksPromise,
       fetchThreadInfoPromise,
     ]);
   if (!hasPermission) {
     throw new ServerError('invalid_credentials');
   }
   const threadInfo = threadInfos[request.communityID];
   if (!threadInfo) {
     throw new ServerError('invalid_parameters');
   }
   const defaultRoleID = Object.keys(threadInfo.roles).find(
     roleID => threadInfo.roles[roleID].isDefault,
   );
   if (!defaultRoleID) {
     throw new ServerError('invalid_parameters');
   }
 
   const existingPrimaryLink = existingPrimaryLinks.find(
     link => link.communityID === request.communityID && link.primary,
   );
   if (existingPrimaryLink) {
     const query = SQL`
       UPDATE invite_links
       SET name = ${request.name}
       WHERE \`primary\` = 1 AND community = ${request.communityID}
     `;
     try {
       await dbQuery(query);
     } catch (e) {
       if (e.errno === MYSQL_DUPLICATE_ENTRY_FOR_KEY_ERROR_CODE) {
         throw new ServerError('already_in_use');
       }
       throw new ServerError('invalid_parameters');
     }
     return {
       name: request.name,
       primary: true,
       role: defaultRoleID,
       communityID: request.communityID,
       expirationTime: null,
       limitOfUses: null,
       numberOfUses: 0,
     };
   }
 
   const [id] = await createIDs('invite_links', 1);
 
   const row = [id, request.name, true, request.communityID, defaultRoleID];
 
   const createLinkQuery = SQL`
     INSERT INTO invite_links(id, name, \`primary\`, community, role)
     SELECT ${row}
     WHERE NOT EXISTS (
       SELECT i.id
       FROM invite_links i
       WHERE i.\`primary\` = 1 AND i.community = ${request.communityID}
     )
   `;
   let result = null;
   const deleteIDs = SQL`
     DELETE FROM ids
     WHERE id = ${id}
   `;
   try {
     result = (await dbQuery(createLinkQuery))[0];
   } catch (e) {
     await dbQuery(deleteIDs);
     if (e.errno === MYSQL_DUPLICATE_ENTRY_FOR_KEY_ERROR_CODE) {
       throw new ServerError('already_in_use');
     }
     throw new ServerError('invalid_parameters');
   }
 
   if (result.affectedRows === 0) {
     await dbQuery(deleteIDs);
     throw new ServerError('invalid_parameters');
   }
 
   return {
     name: request.name,
     primary: true,
     role: defaultRoleID,
     communityID: request.communityID,
     expirationTime: null,
     limitOfUses: null,
     numberOfUses: 0,
   };
 }
 
 export { createOrUpdatePublicLink };
diff --git a/lib/shared/invite-links.js b/lib/shared/invite-links.js
index c9276b328..868f238d1 100644
--- a/lib/shared/invite-links.js
+++ b/lib/shared/invite-links.js
@@ -1,11 +1,14 @@
 // @flow
 
-const inviteLinkErrorMessages = {
+const inviteLinkErrorMessages: { +[string]: string } = {
   invalid_characters: 'Link cannot contain any spaces or special characters.',
   offensive_words: 'No offensive or abusive words allowed.',
   already_in_use: 'Public link URL already in use.',
+  link_reserved:
+    'This public link is currently reserved. Please contact support@' +
+    'comm.app if you would like to claim this link.',
 };
 
 const defaultErrorMessage = 'Unknown error.';
 
 export { inviteLinkErrorMessages, defaultErrorMessage };