iMessage Youtube preview "before you continue

It's not just on iOS. It's also on Messages on the Mac (macOS 10.14.6). It was working fine until March 31, 2021 and at that point something has changed and now previews no longer show. The only solution I found is that if you connect to a VPN with a North American server (US/Canada) then the previews will show up. Kind of a drag to activate VPN though just to share a link. I submitted this bug to both Apple and YouTube. No replies so far. You should do that, too, so they can see people are getting irritated by it.

Having this issue also. It appears to be a combination of two issues; 

Google now insisting on setting a cookie on first visit to a Google/Alphabet page or third party page delivered via AMP.

Apple now sandboxing iMessage as part of their Blast-door protocol to prevent potential exploits spilling out into the OS and other apps. I’m guessing as part of this protocol iMessage now has its own web renderer independent to Safari which operates in private browsing mode so no cookies are ever stored.

Hi there chouchou971one,

It sounds like you're seeing a prompt to agree to some terms and conditions for the Youtube app when attempting to share links in Messages and viewing the preview. We're glad you connected with us here in Apple Support Communities, and we'll point you in the right direction to get this sorted out.

To start, it looks like you must agree to the terms and conditions before you or anyone else can access the content you're trying to share. The next best step is to connect with the Youtube support team for more help with what appears when sharing links from their website or platform. The links below will help you get started:

How to contact an app developer

YouTube Help

Also, in the meantime, you may find this link from YouTube Support helpful:

YouTube Universal Links

Take care.

This doesn’t help the problem, it’s very frustrating and Apple and Google need to figure it out please. Instagram had similar issue earlier in the year.