WP: 6.0.1
Version 2.4.7

Instructions say "[embed] - responsive video embed. Compatible with YouTube, Vimeo, DailyMotion. Example: [embed]https://www.youtube.com/watch?v=HCfPhZQz2CE[/embed]"

ISSUE: When I embed the example or my own URL [embed]https://www.vimeo.com/739328714[/embed], video does not display on the maintenance page, see https://ngcnetworkstv.com

Note:
Bot feature is disabled as noted in instructions
Vimeo video is public.

Plug-Ins:
Akismet Anti-Spam (deactivated)
All-In-One WP Migration (deactivated)
Hosting (deactivated)
WP-Maintenance Mode & Coming Soon (Active)

Embed-Bug1.pdf
Embed-Bug2.pdf