updates by managewp for WPMUDEV dashboard doesn't work

It doesn;t work to update your plugin by ManageWP.

Their reaction:
We have found that the WPMU DEV Dashboard plugin is a premium plugin.

We do try to support most of the premium plugins and themes, but unfortunately, for some premium plugins, our API needs to be implemented in order for the updates to work properly via ManageWP.

Our API can be found here:

https://managewp.com/api

How can we fix this?

Thanks in advance, Stijn