When a Mobotix IoT camera is integrated via ONVIF into a VMS, the VMS will govern the live image of the camera. Even if the resolution is changed via the Web GUI, this will be overridden and set to whatever is defined in the apposing software.
In the case of the MOBOTIX Cloud, the resolution is determined by the settings tied to the monthly subscription.
The underlying reason behind this is due to the large amount a resolutions and aspect ratios on offer in the camera. By allowing the VMS to dictate the resolution, we avoid any situations where the there are resoltuions or aspect ratios that the VMS can not support and avoid placing undue strain on the VMS.