Until last week we have been able to show Vimeo live streamed events ("upcoming" thumbnail and during the live event, same as showed on Vimeo's page) on our web site. Our page only displays the code {vimeo}
vimeo.com/###{/vimeo} until the video has been archived (### is the video number).
Joomla version is 3.9.20 and issue has coincided (I think) with joomla version upgrade. AllVideos version is 6.1.0.