Users exist in sharepoint group:
If I do simple GET request in browser:
https://mycompany.sharepoint.com/sites/testsite2/_api/web/sitegroups/getbytitle('TestGroup')/users/getbyemail('john.theuser@mycompany.com')
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REST api call using method getbyemail for user in a group returns error "Cannot find resource for the request getbytitle"
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