New Meetings Experience appeared then disappeared!

Tanya Denton I had this happen to me recently and I think what I did was closed Teams, cleared the cache, then reopened. Have you given that a shot?

For clearing the cache I copied some code from here and ended up with this PowerShell script that's mighty handy.

$path = $env:APPDATA + "\Microsoft\Teams\*"
Stop-Process -Name Teams -Force -ErrorAction SilentlyContinue; Get-ChildItem $path -directory | Where name -in ('application cache','blob_storage','databases','GPUcache','IndexedDB','Local Storage','tmp') | ForEach{Remove-Item $_.FullName -Recurse -Force}
$path = $env:LOCALAPPDATA + "\Microsoft\Teams\current\Teams.exe"
Start -FilePath $path