diff --git a/.changeset/ldap-merge-email-lookup.md b/.changeset/ldap-merge-email-lookup.md
new file mode 100644
index 0000000000000..58f788eb95e70
--- /dev/null
+++ b/.changeset/ldap-merge-email-lookup.md
@@ -0,0 +1,6 @@
+---
+'@rocket.chat/models': patch
+'@rocket.chat/meteor': patch
+---
+
+Fixes LDAP sync failing to merge an existing user matched by email, which caused a `Username already exists` error when the user's username differed from the directory.
diff --git a/packages/models/src/models/Users.ts b/packages/models/src/models/Users.ts
index cd46792cc9a6e..5447ef4f167f5 100644
--- a/packages/models/src/models/Users.ts
+++ b/packages/models/src/models/Users.ts
@@ -2438,7 +2438,7 @@ export class UsersRaw extends BaseRaw<IUser, DefaultFields<IUser>> implements IU
 
 	findOneWithoutLDAPByEmailAddress(emailAddress: string, options?: FindOptions<IUser>) {
 		const query = {
-			'email.address': emailAddress.trim().toLowerCase(),
+			'emails.address': emailAddress.trim().toLowerCase(),
 			'services.ldap': {
 				$exists: false,
 			},