fix: SAML full name update is not mirrored in DMs (#29838)

.changeset/honest-numbers-compete.md

@@ -0,0 +1,5 @@
+---
+"@rocket.chat/meteor": patch
+---
+
+Fixes SAML full name updates not being mirrored to DM rooms.

apps/meteor/app/meteor-accounts-saml/server/lib/SAML.ts

@@ -123,6 +123,7 @@ export class SAML {
 		}));
 
 		let { username } = userObject;
+		const { fullName } = userObject;
 
 		const active = !settings.get('Accounts_ManuallyApproveNewUsers');
 
@@ -131,7 +132,7 @@ export class SAML {
 			const roles = userObject.roles?.length ? userObject.roles : ensureArray<string>(defaultUserRole.split(','));
 
 			const newUser: Record<string, any> = {
-				name: userObject.fullName,
+				name: fullName,
 				active,
 				globalRoles: roles,
 				emails,
@@ -199,7 +200,7 @@ export class SAML {
 
 		// Overwrite fullname if needed
 		if (nameOverwrite === true) {
-			updateData.name = userObject.fullName;
+			updateData.name = fullName;
 		}
 
 		// When updating an user, we only update the roles if we received them from the mapping
@@ -220,8 +221,8 @@ export class SAML {
 			},
 		);
 
-		if (username && username !== user.username) {
-			await saveUserIdentity({ _id: user._id, username });
+		if (username && fullName && (username !== user.username || fullName !== user.name)) {
+			await saveUserIdentity({ _id: user._id, name: fullName, username });
 		}
 
 		// sending token along with the userId