diff --git a/Tchap/Managers/Invite/InviteService.swift b/Tchap/Managers/Invite/InviteService.swift
index 9bd687c825..062bf568e7 100644
--- a/Tchap/Managers/Invite/InviteService.swift
+++ b/Tchap/Managers/Invite/InviteService.swift
@@ -28,7 +28,6 @@ final class InviteService: InviteServiceType {
     private let session: MXSession
     
     private let discussionFinder: DiscussionFinderType
-    private let identityService: MXIdentityService
     private let userService: UserServiceType
     private let roomService: RoomServiceType
     
@@ -40,14 +39,6 @@ final class InviteService: InviteServiceType {
         self.discussionFinder = DiscussionFinder(session: session)
         self.userService = UserService(session: session)
         self.roomService = RoomService(session: session)
-        
-        let server = session.matrixRestClient.identityServer ?? session.matrixRestClient.homeserver
-        // swiftlint:disable force_unwrapping
-        let identityServerURL = URL(string: server!)!
-        // swiftlint:enable force_unwrapping
-        self.identityService = MXIdentityService(identityServer: identityServerURL,
-                                                 accessToken: nil,
-                                                 homeserverRestClient: self.session.matrixRestClient)
     }
     
     func sendEmailInvite(to email: String, completion: @escaping (MXResponse<InviteServiceResult>) -> Void) {
@@ -119,13 +110,17 @@ final class InviteService: InviteServiceType {
     
     // Check whether a Tchap account has been created for this email. The closure returns a nil identifier when no account exists.
     private func discoverUser(with email: String, completion: @escaping (MXResponse<InviteServiceDiscoverUserResult>) -> Void) {
+        guard let identityService = self.session.identityService else {
+            MXLog.debug("[InviteService] discoverUser failed")
+            completion(MXResponse.failure(InviteServiceError.unknown))
+            return
+        }
         let pid = MX3PID(medium: .email, address: email)
-        _ = self.identityService.lookup3PIDs([pid]) { response in
+        _ = identityService.lookup3PIDs([pid]) { response in
             if let responseValue = response.value?[pid] {
                 completion(MXResponse.success(.bound(userID: responseValue)))
             } else {
-                MXLog.debug("[InviteService] discoverUser failed")
-                completion(MXResponse.failure(InviteServiceError.unknown))
+                completion(MXResponse.success(.unbound))
             }
         }
     }
diff --git a/Tchap/Managers/ThirdPartyIDResolver/ThirdPartyIDResolver.swift b/Tchap/Managers/ThirdPartyIDResolver/ThirdPartyIDResolver.swift
index a69475c625..6b440194ac 100644
--- a/Tchap/Managers/ThirdPartyIDResolver/ThirdPartyIDResolver.swift
+++ b/Tchap/Managers/ThirdPartyIDResolver/ThirdPartyIDResolver.swift
@@ -33,17 +33,13 @@ final class ThirdPartyIDResolver: NSObject, ThirdPartyIDResolverType {
     
     // MARK: - Public
     @objc func bulkLookup(threepids: [[String]],
-                          identityServer: String,
                           success: @escaping (([[String]]) -> Void),
                           failure: @escaping ((Error) -> Void)) -> MXHTTPOperation? {
         
-        guard let identityServerURL = URL(string: identityServer) else {
+        guard let identityService = session.identityService else {
             return nil
         }
         
-        let identityService = MXIdentityService(identityServer: identityServerURL,
-                                                accessToken: nil,
-                                                homeserverRestClient: self.session.matrixRestClient)
         let pids: [MX3PID]? = threepids.compactMap { tempPid in
             return MX3PID.threePidFromArray(tempPid)
         }
diff --git a/Tchap/Managers/ThirdPartyIDResolver/ThirdPartyIDResolverType.swift b/Tchap/Managers/ThirdPartyIDResolver/ThirdPartyIDResolverType.swift
index 1ebf0b813e..783034c2a9 100644
--- a/Tchap/Managers/ThirdPartyIDResolver/ThirdPartyIDResolverType.swift
+++ b/Tchap/Managers/ThirdPartyIDResolver/ThirdPartyIDResolverType.swift
@@ -30,10 +30,11 @@ protocol ThirdPartyIDResolverType {
     ///
     /// - Parameters:
     /// - threepids: the list of 3rd party ids
-    /// - identityServer: the url of the identity server to proxy the request to if the homeserver is allowed to do so
     /// - success: A block object called when the operation succeeded.
     /// - failure: A block object called when the operation failed.
     ///
     /// - returns: a `MXHTTPOperation` instance.
-    func bulkLookup(threepids: [[String]], identityServer: String, success: @escaping (([[String]]) -> Void), failure: @escaping ((Error) -> Void)) -> MXHTTPOperation?
+    func bulkLookup(threepids: [[String]],
+                    success: @escaping (([[String]]) -> Void),
+                    failure: @escaping ((Error) -> Void)) -> MXHTTPOperation?
 }
diff --git a/Tchap/Modules/Contacts/DataSources/ContactsDataSource.m b/Tchap/Modules/Contacts/DataSources/ContactsDataSource.m
index ea663e2743..de54f68a26 100644
--- a/Tchap/Modules/Contacts/DataSources/ContactsDataSource.m
+++ b/Tchap/Modules/Contacts/DataSources/ContactsDataSource.m
@@ -690,10 +690,7 @@ - (void)updateDirectTchapContacts
                 }
             };
             
-            // Tchap: Consider the homeserver if the identity server is missing (this was the old behavior in Riot)
-            NSString *identityServer = self.mxSession.matrixRestClient.identityServer ? self.mxSession.matrixRestClient.identityServer : self.mxSession.matrixRestClient.homeserver;
             self->lookup3pidsOperation = [thirdPartyIDResolver bulkLookupWithThreepids:lookup3pidsArray
-                                                                        identityServer:identityServer
                                                                                success:success
                                                                                failure:^(NSError *error) {
                                                                                    NSLog(@"[ContactsDataSource] lookup3pids failed");
diff --git a/Tchap/Modules/Home/HomeCoordinator.swift b/Tchap/Modules/Home/HomeCoordinator.swift
index e820e1e76b..3beb52281b 100644
--- a/Tchap/Modules/Home/HomeCoordinator.swift
+++ b/Tchap/Modules/Home/HomeCoordinator.swift
@@ -190,7 +190,6 @@ final class HomeCoordinator: NSObject, HomeCoordinatorType {
                 }
                 
                 _ = self.thirdPartyIDResolver.bulkLookup(threepids: threepids,
-                                                         identityServer: self.identityServer,
                                                          success: success,
                                                          failure: failure)
             }
diff --git a/changelog.d/479.bugfix b/changelog.d/479.bugfix
new file mode 100644
index 0000000000..12ef48b8ce
--- /dev/null
+++ b/changelog.d/479.bugfix
@@ -0,0 +1 @@
+Fix Invite by email a new user failed