<iframe> with player and chat does not have access to Twitch.tv cookies, which store, among other things, authorization data. As a result, the user cannot send messages, make clips, follow, etc.
Twitch.tv cookies do not have SameSite attribute. Chrome 79 treat such cookies as “SameSite=Lax” and blocks
<iframe> from access them. Twitch developers must add “SameSite=None” and “Secure” attributes ASAP to fix this bug.