If you’re getting an CommercialUnsupportedException with an exception like “The organization request type ‘Microsoft.Xrm.Sdk.Messages.’ … is not yet supported” generally means FakeXrmEasy is not able to find an implementation for that particular OrganizationRequest.
However, most of these implementations live in a dedicated separate package, FakeXrmEasy.Messages..
Please check if you have installed that package first.
Then head off to the messages section configuration that explains how to setup these messages in the middleware config.
The current list of implemented fake message executors live in this repo: https://github.com/DynamicsValue/fake-xrm-easy-messages/tree/2x-dev/src/FakeXrmEasy.Messages/FakeMessageExecutors
If, after trying all of the above, you are still having issues, please reach out to support.