cannot arm the ring system via Homekit
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# Bug Report

### Describe the Bug
cannot arm the ring system via Homebridge / Homekit

### To Reproduce
Steps to reproduce the behavior:
 - Start Homebridge
 - Attempt to arm ring (set to away / abwesend)
 - no error in the log - confirmation ([06/03/2021, 14:05:30] [Ring] Setting Köln Mode to away)

### Expected behavior
Ring system must armed. But in the App (ios 15.2.1) its still at home (Zuhause) and not away (abwesend).

### Screenshots/Logs
[Apple Home] (https://bilderupload.org/bild/1a6859804-img-3229)
[ring iOS App] (https://bilderupload.org/bild/7dd059840-img-3228)


### Additional context
arm and disarm did not work anymore. Its works perfect for some time ago but now for serval days not. 


### Homebridge Ring Config
Post homebridge-ring platform config  _without sensitive information_
` {
            "refreshToken": "xxx",
            "platform": "Ring"
        }``

HIGHLIGHT THIS TEXT AND POST CONFIG HERE
DO NOT INCLUDE YOUR REFRESH TOKEN OR EMAIL/PASSWORD (replace them with xxx)

```

### Environment
<!-- ✍️edit: -->
 - OS: Raspberian
 - Node.js: 14.16.0
 - NPM: 7.6.1
 - homebridge-ring: 9.15.4
 - homebridge: 1.3.2

*Update to
iOS 15.2.1
Homebridge 1.4.0
Node 16.14.0
npm 8.5.0
homebridge-ring v9.24.0
