I think the field you want is the value of the Highway.
For example, I have a multi-choice column called TicketStatus.

The Dynamic content I need to use in the Switch action is value of Ticket Status:

For example, behind the scenes, TicketStatus data looks like this for the first item in my SharePoint list:
"TicketStatus": {
"@odata.type": "#Microsoft.Azure.Connectors.SharePoint.SPListExpandedReference",
"Id": 1,
"Value": "Assigned"}
TicketStatus Value is equal to "Assigned" - which is what I need to use in the Switch action.
Hope this helps.
Ellis
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