On executing: sfdx force:mdapi:retrieve -r ./mdapipkg -p ./ProjectComponents.xml I got the error message: metadata retrieve operation failed: INVALID_CROSS_REFERENCE_KEY: No package named
The file ProjectComponents.xml is ok - I used it in Workbench to retrieve and it works ok. Here is the file:
<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
<Package xmlns="http://soap.sforce.com/2006/04/metadata">
<types>
<members>Case.List_View_237</members>
<name>ListView</name>
</types>
<version>51.0</version>
</Package>