I don't have the time right now to plot you out a solution, @Edd-Keogh ... but you can figure this out by trying a few things and a bit of trial and error. The bonus is that the knowledge will stick. 🙂
So, if you find an item in a list which has more than one user in the people column, then look at the JSON which is output when you get the details for the list item ... you will then be able to see what you need to construct to put in the field above.
It will almost definitely need to be a JSON array, which will look something like this:
[
"i:0#.f|membership|eliot.cole@keogh.com",
"i:0#.f|membership|edd.keogh@keogh.com"
]
So you need to work out how to get that detail about the users that you want to put in there. You will find that I'm sure, no problems.
Once you have the knowledge that this is how the data needs to look, you will work out how to plop it into the 'Team Members Claims' section. But if you want a hint, just tap that tiny little 'T' box on the right, and it will let you include JSON in there.
So, now that you have worked out what you need to put in, how you need to put it in, and where you need to put it in, it's just a matter of getting it in the right format in the first place! 🙂
((( I'd recommend either using a select action to reshape your array of users, or a quick apply to each to add them to an array then plop the select / array in the 't' box! )))