The errors you’ve shared are Vimeo errors, which means they’re related to your hosting of videos on www.vimeo.com. This isn’t related to Webflow at all.
For what it’s worth, the link you shared is showing the video fine ( I’m in Auckland, New Zealand currently )
If they are consistently getting this problem, than the most likely issue is a firewall at the school or work they are accessing your site from. It’s blocking Vimeo, probably to avoid too much company time invested in cat v. cucumber memes.
They’ll need to talk to their network administrator.