Hi Abhishek,

Please check with below piece of code if you have done the same.

<?xml version="1.0" encoding="UTF-8"?>
<Report xmlns="http://soap.sforce.com/2006/04/metadata">
    <columns>
        <field>User.Volunteer_Shift_Workers__r$Name</field>
    </columns>
    <columns>
        <field>User.Volunteer_Shift_Workers__r$Shift_Start_Time__c</field>
    </columns>
    <columns>
        <field>User.Volunteer_Shift_Workers__r$Volunteer_Activity__c</field>
    </columns>
    <columns>
        <field>User.Volunteer_Shift_Workers__r$Volunteer_Job__c</field>
    </columns>
    <columns>
        <field>User.Volunteer_Shift_Workers__r$Volunteer_Organization__c</field>
    </columns>
    <filter>
        <criteriaItems>
            <column>User.Volunteer_Shift_Workers__r$Status__c</column>
            <isUnlocked>false</isUnlocked>
            <operator>equals</operator>
            <value>Pending Approval</value>
        </criteriaItems>
        <criteriaItems>
            <column>User.Volunteer_Shift_Workers__r$IsShiftVolunteer__c</column>
            <isUnlocked>true</isUnlocked>
            <operator>equals</operator>
            <value>1</value>
        </criteriaItems>
    </filter>
    <format>Tabular</format>
    <name>My Shifts Pending Approval</name>
    <params>
        <name>co</name>
        <value>1</value>
    </params>
    <reportType>Users_with_Volunteer_Shift_Worker_Records__c</reportType>
    <scope>organization</scope>
    <showDetails>true</showDetails>
    <timeFrameFilter>
        <dateColumn>User.Volunteer_Shift_Workers__r$CreatedDate</dateColumn>
        <interval>INTERVAL_CUSTOM</interval>
    </timeFrameFilter>
</Report>

The above code works fine for me and was able to pass the challenge.

Please let us know if this helps.

Kindly mark this as solved if the reply was helpful.

Thanks,
Nagendra