Microsoft Teams Webinar: Register Button Disappear on Mobile Phone

Hi, I'm hosting a Teams online seminar event in November and many of my audiences have reported that they couldn't find the register button when they visited the event register page created by Teams webinar on their mobile phone. I checked it myself by using my mobile phone and indeed, I couldn't see the button either. Here is the link to my webinar. https://events.teams.microsoft.com/event/12b61ece-d9a4-4c8b-97b0-1b51ffcdceed@3f6708e0-4f16-4ab7-84ba-c3d93c90d7dc I assume this is probably a bug from the Teams Webinar. Please help.