From the 2.10.6 readme.
MediaCentral Production Management.
If integrating with MediaCentral Production Management v2018.6 or later, you must use Interplay Access v3.8 - v2017.2 to configure the MediaCentral Platform Services Settings in the Interplay Administrator. Avid Interplay Administrator v2018.6 cannot be used with MediaCentral 2.10.x.
Sorry but here I go again. Have you lost your mind Avid? Who thought that this is was ok?