Does anyone have an organization design/structure around a team labeled “employee productivity”, “modern work”, or “enterprise digital” - team mostly comprised of Microsoft professionals but can see the team expanding into non-MS areas as well (eg AI)? I am mostly trying to figure out the ‘Level 2’ domains of the team.

I'm the head of the Digital Workplace team at my organization.  While we are mostly comprised of engineers and product leaders supporting Microsoft technologies, we do support other vendor products as well (e.g. Cisco Webex, Zoom, Confluence, Apple mac and mobile, etc).  The way we are structured is by product squad supporting one or several related products, and those squads provide 2nd and 3rd level support for their products.  However, we do have a team called Advanced Technical Support that covers level 2 tickets for our more common services/issues, such as email questions, distribution group changes, endpoint support, and things like that. 

Please feel free to reach out if you have specific questions.
 

I am not sure if this is what you are looking for but we have an "End-User Technology" team that has some focus in this area.  They typically group those efforts into Personal Productivity, Collaboration, Tactical Effort, Strategic Effort.