How to enable Camera and Microphone access in Safari if you are using the Browser/Web based version of Sessions on an iPhone or iPad.
When you first use Sessions, you will be prompted to allow access to your Camera and Microphone - ensure you select Allow at that moment:
If your camera or microphone is ever blocked:
1. Select aA to the left of your search/URL bar.
2. Then select Website Settings: 
3. Ensure your camera and microphone are set to Allow: 
4. Select Done and refresh Safari