This video is about How you can add multiple users to SharePoint group automatically using Power automate. Below are the syntax for Send HTTP request to SharePoint.
Api end pont:
_api/web/sitegroups(GroupID)/users
Headers:
accept
application/json;odata=verbose
content-type
application/json;odata=verbose
Body:
{"__metadata":{"type":"SP.User"},"LoginName":"XYZclaims"}
{"__metadata":{"type":"SP.User"},"LoginName":"i:0#.f|membership|XYZclaims"}