Using a work computer?
In some cases your company may block websites which they have not reviewed and allowed.
You will be able to attend the event as a viewer but you may face issues when wanting to turn on your camera and microphone. The permissions may be blocked in your browser and only you company IT can solve this.
You can check in your google chrome tab settings
Click the 3 dots in the right corner of your google chrome tab and choose Settings
The click Privacy & Security > Site Settings > Camera > make sure the site is not in the block section. If it is then remove and do the same process for microphone.
If you are still facing issues and you have tested the How to give access to your cam and mic
Double check by clicking on the padlock in the url of the virtual lobby page.
if the camera and microphone are blocked or the sections are grey'd out and you cannot set to allow, then your company is probably blocking permissions for the site, you should report to your IT.