Unable to add duplicated modern dashboards as tabs in NPM

When a modern dashboard is created by duplicating an existing dashboard, the duplicated dashboard will not be available under Configure Dashboard Tabs. New modern dashboards, created using the Add modern dashboard option, can be added as tabs as expected.

In the dashboard table, modern dashboards created by duplicating an existing dashboard will not have a UniqueKey, and will have a ParentID. A bug prevents dashboards without a UniqueKey from being added as tabs.

A workaround is to edit the Dashboard table to create a UniqueKey for the affected dashboard (and optionally remove the ParentID, although this is not actually necessary).

For each affected dashboard, change $value to a unique name (in single quotes), and $id to the ID of the affected dashboard (without the '$' signs). 

Ensure the UniqueKey does not contain spaces, otherwise you will get a "404 File Not Found" error when attempting to access the dashboard tab.

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UPDATE [dbo].[Dashboard]
SET UniqueKey = $value, ParentID = NULL
WHERE DashboardID = $id AND UniqueKey IS NULL