You have missed to add CrudUrl in the dataManager settings. So that the CRUD actions are not working. So we would suggest you to refer and follow the below sample.
Sample: https://stackblitz.com/edit/react-schedule-url-adaptor-two-level-resource?file=index.js
this.dataManger = new DataManager({
url: 'http://localhost:54738/Home/LoadData',
crudUrl: 'http://localhost:54738/Home/UpdateData',
crossDomain: true,
adaptor: new UrlAdaptor
});
UG: https://ej2.syncfusion.com/react/documentation/schedule/data-binding/#scheduler-crud-actions
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solved React SyncFusion Resource and grouping crud not binding the data in scheduler