Hi @john john ,
I don't think we could retrieve Users or Groups seperately from a “People and Groups” column in flow.
Currently, Flow doesn’t let us assign directly to anything other than an email address.
It's necessary to get all user emails from SharePoint groups or office 365 groups first, than send the approval.
For more information, please refer to:
https://wonderlaura.com/2020/01/27/power-automate-approval-to-office-365-group-members/
intelogy.co.uk/blog/assigning-microsoft-flow-approvals-to-sharepoint-groups/
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