Philips TV - select source not working

I have a Philips 55PUS7101/12 model with Jointspace API v6.2.0. Everything is working correctly except the switching of sources (i.e HDMI inputs).

When I try to switch the source I see the following in the error logs:

2021-05-08 09:44:23 WARNING (MainThread) [haphilipsjs] Post failed: {'intent': {'extras': {'uri': 'content://android.media.tv/passthrough/com.mediatek.tvinput%2F.hdmi.HDMIInputService%2FHW7'}, 'action': 'org.droidtv.playtv.SELECTURI', 'component': {'packageName': 'org.droidtv.playtv', 'className': 'org.droidtv.playtv.PlayTvActivity'}}} -> <html>
<head>
<title>Status page</title>
</head>
<body style="font-family: sans-serif;">
<p style="font-size: 1.2em;font-weight: bold;margin: 1em 0px;">Bad Request</p>
<p>The request could not be understood by the server due to malformed syntax</p>
<p>You can get technical details <a href="http://www.w3.org/Protocols/rfc2616/rfc2616-sec10.html#sec10.4.1">here</a>.<br>
Please continue your visit at our <a href="/">home page</a>.
</p>
</body>
</html>

And this is the snippet of my jointspace system settings:

{
  "notifyChange": "http",
  "menulanguage": "Dutch",
  "name": "TV woonkamer",
  "country": "Netherlands",
  "serialnumber_encrypted": "IIH9QhWEVJe9bTcEs4UrEFChgJsZkPyWIv3hwO4VHuU=\n",
  "softwareversion_encrypted": "xwEI4ePYTIp6k+gTXIRmvrjidPRMZ4XDP0ooqct77vI=\n",
  "model_encrypted": "Ivx0/4r7qIZE2GqilCib6qX1eael8IboYi6T03fw4vA=\n",
  "deviceid_encrypted": "bzJdt5trHBCD6B8BxOrAE6U+hA1nlWVouk/Za1P+r48=\n",
  "nettvversion": "8.1.3",
  "epgsource": "one",
  "api_version": {
    "Major": 6,
    "Minor": 2,
    "Patch": 0
  },
  "featuring": {
    "jsonfeatures": {
      "editfavorites": [
        "TVChannels",
        "SatChannels"
      ],
      "recordings": [
        "List",
        "Schedule",
        "Manage"
      ],
      "ambilight": [
        "LoungeLight",
        "Hue",
        "Ambilight"
      ],
      "menuitems": [
        "Setup_Menu"
      ],
      "textentry": [
        "context_based",
        "initial_string_available",
        "editor_info_available"
      ],
      "applications": [
        "TV_Apps",
        "TV_Games",
        "TV_Settings"
      ],
      "pointer": [
        "not_available"
      ],
      "inputkey": [
        "key"
      ],
      "activities": [
        "intent"
      ],
      "channels": [
        "preset_string"
      ],
      "mappings": [
        "server_mapping"
      ]
    },
    "systemfeatures": {
      "tvtype": "consumer",
      "content": [
        "dmr",
        "dms_tad"
      ],
      "tvsearch": "intent",
      "pairing_type": "digest_auth_pairing",
      "secured_transport": "true"
    }
  }
}

Anybody has a clue why this is not working for my TV?