The checkbox on the approval process "The approver's delegate can also approve this request" is checked, and the user has access to the record. However, a delegated approver can`t see anything in the Items to approve list in the home page. The following workaround can be used to see the list of pending approval records.
Only users directly assigned as approvers can see the records in the Items to-approve list. During creation of approval process, if the option “The approver's delegate may also approve this request" was selected, the records will not be listed in the items to approve section. To view these records, the following workaround can be used:
Vote and comment on the Salesforce Idea Exchange - Items to Approve Home Page Component for Delegate Approvers.
Salesforce Idea Exchange on reporting - Approval History as a relatable object in Custom Report Types (CRT)
Approval Process Email Notifications Not Received by Some Users
Why am I not receiving any email approval requests
000385979

We use three kinds of cookies on our websites: required, functional, and advertising. You can choose whether functional and advertising cookies apply. Click on the different cookie categories to find out more about each category and to change the default settings.
Privacy Statement
Required cookies are necessary for basic website functionality. Some examples include: session cookies needed to transmit the website, authentication cookies, and security cookies.
Functional cookies enhance functions, performance, and services on the website. Some examples include: cookies used to analyze site traffic, cookies used for market research, and cookies used to display advertising that is not directed to a particular individual.
Advertising cookies track activity across websites in order to understand a viewer’s interests, and direct them specific marketing. Some examples include: cookies used for remarketing, or interest-based advertising.