diff --git a/FAQ.md b/FAQ.md
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--- a/FAQ.md
+++ b/FAQ.md
@@ -4423,6 +4423,10 @@ If needed you can find the right settings [here](https://support.apple.com/en-us
When using two-factor authentication you might need to use an [app-specific password](https://support.apple.com/en-us/HT204397).
+Please make sure you use the main email address and not an alias address.
+It is not possible to authenticate an iCloud account with an alias address.
+If you want to create an alias address, first configure the main account, and after that see [this FAQ](#faq9).
+
diff --git a/index.html b/index.html
index 9b5d15c17b..c2eb99d405 100644
--- a/index.html
+++ b/index.html
@@ -2227,6 +2227,7 @@ $NotDisplayed
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There is a built-in profile for Apple iCloud, so you should be able to use the quick setup wizard (other provider). If needed you can find the right settings here to manually set up an account.
When using two-factor authentication you might need to use an app-specific password.
+Please make sure you use the main email address and not an alias address. It is not possible to authenticate an iCloud account with an alias address. If you want to create an alias address, first configure the main account, and after that see this FAQ.
(149) How does the unread message count widget work?
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