I actually heard the details on a cloud-related podcast, but I found a transcript of the episode here: https://www.lastweekinaws.com/podcast/aws-morning-brief/whit...

The relevant bit:

>[customers] were texting with their account managers, because the account managers had no access to any internal systems. Reportedly, the corporate VPN was not working. My thesis is... everything was single-tracking through a corporate VPN that itself was subject to this disruption... their traditional tweets have been done through an enterprise social media client called Sprinklr