endpoint = _api/SPSiteManager/create payload = { "request": { "Title": "Rushi", "Url":"https://xyz.sharepoint.com/sites/rushi", "Lcid": 1033, "ShareByEmailEnabled":false, "Classification":"Low...
If your using a app to create the SharePoint site you might need to have
"Owner":"email address removed for privacy reasons",
in your payload/body
https://learn.microsoft.com/en-us/sharepoint/dev/apis/site-creation-rest#create-a-modern-site