Microsoft is already aware of this issue and explains that those users who’re seeing this error code 0xC002001B on their devices using a processor (CPU) that supports Control-flow Enforcement Technology (CET) like 11th generation Intel® Core™ processors or above accompanied by some AMD processor. Microsoft has already fixed the bug with the cumulative update KB5015020 for Windows 10. However, it is available for download only through the Microsoft Catalog and affected users have to install it manually. Head over to this Microsoft support page, and you will find all the details about the update which includes the update package and instructions about how to install it. Are you seeing Microsoft Store error code 0xC002001B? Does the update fix the issue for you? Let us know in the comments.

Fix   Microsoft Store Error Code 0xC002001B in Windows 10 While Installing Apps - 93