Issue with Event Retrieval Using BackgroundSyncService in Notification Service Extension

[YashThakarSimform]

In the notification service extension, I’m unable to retrieve events using backgroundSyncService.
I’m currently using version 0.27.6 of the Matrix SDK.
When a user logs out, I call the following code to remove the pusher:

guard let pushNotificationsDeviceToken = userManager.pushNotificationsDeviceToken,
              let mxRestClient = session?.matrixRestClient else { return }
        mxRestClient.setPusher(pushKey: pushNotificationsDeviceToken,
                               kind: .none,
                               appId: AppConstant.matrixPusherAppId,
                               appDisplayName: matrixAppDisplayName,
                               deviceDisplayName: matrixDeviceDisplayName,
                               profileTag: "",
                               lang: matrixLang,
                               data: [:],
                               append: false) { response in
            switch response {
            case .success:
                Logger().log("successfully disable pusher")
            case .failure(let error):
                Logger().log("Disable pusher fail: \(error.localizedDescription, privacy: .public)")
            }
        }

Once the user logs back in, I re-register the pusher. However, when a notification arrives in the notification service extension, the backgroundSyncService doesn’t retrieve events; neither the success nor failure blocks are triggered.
Additionally, the mxRestClient mxRestClient.presence(forUser: userId, completion: { _ in }) function behaves similarly, as it isn’t calling the completion block.

private var backgroundSyncService: MXBackgroundSyncService? {
        guard let userCredentials else { return nil }
        return MXBackgroundSyncService(withCredentials: userCredentials)
    }

func getEvent(eventId: String, roomId: String, completion: @escaping (MXEvent?) -> Void) {
        guard let backgroundSyncService else {
            Logger().log("backgroundSyncService Not Found")
            return
        }
        Logger().log("backgroundSyncService Found")
        backgroundSyncService.event(withEventId: eventId, inRoom: roomId, allowSync: false, completion: { response in
            switch response {
            case .success(let event):
                completion(event)
            case .failure:
                completion(nil)
            }
        })
    }