Hello Experts

I am New to the Salesforce Ecosystem, i am trying to design a functionality where custom reports needs to be sent via Email With attachment, i know this beta version, but i need to design through customization, i have researched a lot and finally came up with the link

https://blogs.absyz.com/2018/09/27/sending-reports-to-email-as-an-attachment/

i have done exactly the same but dont know why its not working, could any one 

Visualforce Component
 

<apex:component controller="ReportsToEmailController" access="global">
    <apex:attribute name="ReportId" description="Report ID" type="Id" assignTo="{!rptId}"/>
    <apex:outputPanel>         
        <table style="width: 100%;">
            <thead>                 
                <apex:repeat value="{!ReportResult.reportMetadata.detailColumns}" var="colName"> 
 
                    <!-- reportMetadata is a class where it contains metadata of a report.
                        DetailColumns is a method of ReportMetadata class, it returns the API names (Columns Names) 
                            for the fields that contain detailed data-->
 
                    <th><apex:outputText value="{!ReportResult.reportExtendedMetadata.detailColumnInfo[colName].label}"/></th>
 
                    <!-- reportExtendedMetadata is class where it contains Report extended metadata and
                            it provides data type and label information.
                        detailColumnInfo is a method of reportExtendedMetadata class, it returns map of columns names 
                            and its label to Display as Header -->
 
                </apex:repeat> 
            </thead> 
            <tbody> 
                <apex:repeat value="{!ReportResult.factMap['T!T'].rows}" var="row" rows="999"> 
                    <!-- Here we will get entire data of each row and T refers to the Row -->
                    <tr> <apex:repeat value="{!row.dataCells}" var="cell">
                        <!-- Here we will get data of each cell and displayed -->
                        <td><apex:outputText value="{!cell.label}"/></td>
                        </apex:repeat> </tr> 
                </apex:repeat>
            </tbody>
        </table>
    </apex:outputPanel> 
</apex:component>

Apex Controller: ReportsToEmailController
 

public class ReportsToEmailController {
    public Id rptId { get; set; } // Here we will get the report Id from the VF Component
    private transient Reports.ReportResults results; // It will hold the entire data of a report
 
    /*********************
     // Method Name : getReportResult
     // Description : Here we will get the data of a report and send to the VF Component
    /********************/
 
    public Reports.ReportResults getReportResult() {
        // Here it will run the report with that report ID and adding the report data into results
        results = Reports.ReportManager.runReport(rptId, true);
        return results;
    }
}

My custom VF template where 
 

<messaging:emailTemplate subject="Report" recipientType="User" >
    <messaging:plainTextEmailBody >
        Hi {!recipient.FirstName}
        Please find the below attachments. 
 
    </messaging:plainTextEmailBody>
    <messaging:attachment filename="Opp Record Report.xls">
        <!-- Here we can add multiple Reports -->
        <c:ReportsToEmail ReportId="00O2w000003DegwEAC"/>
        <c:ReportsToEmail ReportId="00O2w000003DegwEAC"/>
    </messaging:attachment>
</messaging:emailTemplate>

Next i have Designed workflow rule where when checkbox update  with Email alert, but i am not recieveing any mails, Any help will be highly appreciated