diff --git a/FAQ.md b/FAQ.md
index 3c5cfebbac..36ef1cefd2 100644
--- a/FAQ.md
+++ b/FAQ.md
@@ -3966,6 +3966,7 @@ The confusing Microsoft specific server error *User is authenticated but not con
 * SMTP was administratively disabled, please see [this article](https://docs.microsoft.com/en-us/exchange/clients-and-mobile-in-exchange-online/authenticated-client-smtp-submission) about how an administrator can enable it again
 * Push messages are enabled for too many folders: see [this FAQ](#user-content-faq23) for more information and a workaround
 * There were too many login attempts in a too short time, for example by using multiple email clients at the same time
+* An ad blocker or DNS changer is being used
 * There is a problem with the Exchange server license: it might be expired or for another server edition
 * An alias email address is being used as username instead of the primary email address
 * An incorrect login scheme is being used for a shared mailbox: the right scheme is *username@domain\SharedMailboxAlias*