Video Preview in Home App Disappeared.
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**Describe The Problem:**
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Pretty much what the title says. I installed a G4 doorbell last week. Then I updated my Homebridge system and added this plug-in. Everything worked well for a few days, then I noticed this morning the video preview was missing from the Home App.

**To Reproduce:**
<!-- Steps to reproduce the behavior. -->
There really aren't any reproduction steps since it just stopped working. I have updated UDM Protect, rebooted the camera, and rebooted my Homebridge host machine.

**Logs:**
<!-- In order to be helpful, include the relevant logs from Homebridge, if applicable. -->

```
[9/13/2021, 8:28:15 AM] [HB Supervisor] Homebridge Process Ended. Code: 143, Signal: null
[9/13/2021, 8:28:20 AM] [HB Supervisor] Restarting Homebridge...
[9/13/2021, 8:28:20 AM] [HB Supervisor] Starting Homebridge with extra flags: -I
[9/13/2021, 8:28:20 AM] [HB Supervisor] Started Homebridge v1.3.4 with PID: 6899
Initializing HAP-NodeJS v0.9.4...
[9/13/2021, 8:28:21 AM] Loaded config.json with 0 accessories and 3 platforms.
[9/13/2021, 8:28:21 AM] Loaded 12 cached accessories from cachedAccessories.
[9/13/2021, 8:28:21 AM] ---
[9/13/2021, 8:28:21 AM] Loaded plugin: homebridge-config-ui-x@4.41.2
[9/13/2021, 8:28:21 AM] Registering platform 'homebridge-config-ui-x.config'
[9/13/2021, 8:28:21 AM] ---
[9/13/2021, 8:28:21 AM] Loaded plugin: homebridge-nest@4.5.3
[9/13/2021, 8:28:21 AM] Registering platform 'homebridge-nest.Nest'
[9/13/2021, 8:28:21 AM] ---
[9/13/2021, 8:28:21 AM] Loaded plugin: homebridge-unifi-protect@4.4.3
[9/13/2021, 8:28:21 AM] Registering platform 'homebridge-unifi-protect.UniFi Protect'
[9/13/2021, 8:28:21 AM] ---
[9/13/2021, 8:28:21 AM] Loading 3 platforms...
[9/13/2021, 8:28:21 AM] [Config] Initializing config platform...
[9/13/2021, 8:28:21 AM] [Config] Running in Service Mode
[9/13/2021, 8:28:21 AM] [Nest] Initializing Nest platform...
[9/13/2021, 8:28:21 AM] [UniFi Protect] Initializing UniFi Protect platform...
[9/13/2021, 8:28:21 AM] [Nest] Fetching Nest devices.
Preparing Advertiser for 'Homebridge 3244 254C' using bonjour-hap backend!
Setup Payload:
X-HM://0024M14WMLG9M
Enter this code with your HomeKit app on your iOS device to pair with Homebridge:
                       
    ┌────────────┐     
    │ 690-31-190 │     
    └────────────┘     
                       
Starting to advertise 'Homebridge 3244 254C' using bonjour-hap backend!
[9/13/2021, 8:28:21 AM] Homebridge v1.3.4 (Homebridge 3244) is running on port 51370.
[9/13/2021, 8:28:22 AM] [UniFi Protect] UDMPRO [UDM-PRO]: Connected to the Protect controller API (address: 192.168.1.1 mac: E063DACF8161).
[9/13/2021, 8:28:22 AM] [UniFi Protect] UDMPRO [UDM-PRO]: Connected to the UniFi realtime update events API.
[9/13/2021, 8:28:22 AM] [UniFi Protect] UDMPRO [UDM-PRO]: Discovered camera: Front Door [UVC G4 Doorbell] (address: 192.168.1.222 mac: E063DAAFC043).
[9/13/2021, 8:28:22 AM] [UniFi Protect] UDMPRO [UDM-PRO]: Controller refresh interval set to 10 seconds.
[9/13/2021, 8:28:22 AM] [UniFi Protect] UDMPRO [UDM-PRO] Front Door [UVC G4 Doorbell]: Discovered doorbell message switch: LEAVE PACKAGE AT DOOR.
[9/13/2021, 8:28:22 AM] [UniFi Protect] UDMPRO [UDM-PRO] Front Door [UVC G4 Doorbell]: Discovered doorbell message switch: DO NOT DISTURB.
[9/13/2021, 8:28:25 AM] [Nest] initing thermostat "Upstairs Thermostat": deviceId: 09AA01AC421703T3 structureId: 1ac57790-9b2a-11e7-af14-126cc423ee56
[9/13/2021, 8:28:25 AM] [Nest] initing thermostat "Downstairs Thermostat": deviceId: 09AA01AC421703X0 structureId: 1ac57790-9b2a-11e7-af14-126cc423ee56
[9/13/2021, 8:28:25 AM] [Nest] initing home_away_sensor "Home Occupied": deviceId: 1ac57790-9b2a-11e7-af14-126cc423ee56 structureId: 1ac57790-9b2a-11e7-af14-126cc423ee56
[9/13/2021, 8:28:25 AM] [Nest] initing protect "Rear": deviceId: 18B43000009E1F3D structureId: 1ac57790-9b2a-11e7-af14-126cc423ee56
[9/13/2021, 8:28:25 AM] [Nest] initing protect "Basement": deviceId: 18B43000009E2BF4 structureId: 1ac57790-9b2a-11e7-af14-126cc423ee56
[9/13/2021, 8:28:25 AM] [Nest] initing protect "Living Room": deviceId: 18B43000009E1F30 structureId: 1ac57790-9b2a-11e7-af14-126cc423ee56
[9/13/2021, 8:28:25 AM] [Nest] initing protect "Front": deviceId: 18B43000009E3371 structureId: 1ac57790-9b2a-11e7-af14-126cc423ee56
[9/13/2021, 8:28:25 AM] [Nest] initing protect "Hallway": deviceId: 18B43000009E2EB0 structureId: 1ac57790-9b2a-11e7-af14-126cc423ee56
[9/13/2021, 8:28:25 AM] [Nest] initing protect "Master Bedroom": deviceId: 18B43000009E1B4E structureId: 1ac57790-9b2a-11e7-af14-126cc423ee56
[9/13/2021, 8:45:49 AM] [UniFi Protect] API access error: 500 - Internal Server Error
[9/13/2021, 8:45:49 AM] [UniFi Protect] UDMPRO [UDM-PRO]: Unable to retrieve NVR configuration information from UniFi Protect. Will retry again later.
[9/13/2021, 8:46:01 AM] [UniFi Protect] UDMPRO [UDM-PRO]: Connected to the Protect controller API (address: 192.168.1.1 mac: E063DACF8161).
[9/13/2021, 8:46:01 AM] [UniFi Protect] UDMPRO [UDM-PRO]: Connected to the UniFi realtime update events API.
```

**Homebridge Configuration:**

```json
{
    "bridge": {
        "name": "Homebridge 3244",
        "username": "0E:59:1A:46:32:44",
        "port": 51370,
        "pin": "690-31-190"
    },
    "accessories": [],
    "platforms": [
        {
            "name": "Config",
            "port": 80,
            "auth": "form",
            "theme": "auto",
            "tempUnits": "f",
            "lang": "auto",
            "platform": "config"
        },
        {
            "name": "Nest",
            "access_token": "snipped",
            "platform": "Nest"
        },
        {
            "controllers": [
                {
                    "address": "192.168.1.1",
                    "password": "local_admin",
                    "username": "local_admin"
                }
            ],
            "platform": "UniFi Protect"
        }
    ]
}
```

**Screenshots:**
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**Environment:**

* **Homebridge Version:** 1.3.4
* **Node Version:** 12.22.6
* **Homebridge-UniFi-Protect Plugin Version:** 4.4.3
* **UniFi Protect Version:** 1.19.0
* **UniFi Protect Controller Type:** UDM-Pro
* **UniFi Protect Controller Firmware Version:** 1.10.0
* **Apple Device and iOS / macOS / iPadOS / tvOS Version:** iPhone 12 Pro w/ iOS 14.7.1
* **Operating System and OS Version:** Debian 10.10

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