A user reports they are unable to see the Managed Asset Viewer on Account record...

In Lightning App Builder, drag the Managed Asset Viewer to the Account record page. Select the checkbox to show the side panel when a user clicks a record link.

Assign the user a permission set that grants Read access to Account record pages and Read access to Assets. Next, drag it onto the Account page layout.

Verify that the user has the Revenue Lifecycle Management license. Then, enable the Assets-related list on the Account record page to show the Managed Asset Viewer