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Hello @Rob Joosen ,
Apologies for the late reply from our side .
As we understand the ask here is why the On Prem Dynamics 365 works fine in copy activity but does not work in the Mapping data flow , please do let us know if it’s not accurate.While working with the On prem Dynamics with copy activity , I am sure that you are using Self hosted integration runtime ( SHIR ) which helps us connect the on prem to cloud .
Mapping data flow does not support SHIR and hence the error .
This is called out here : https://learn.microsoft.com/en-us/azure/data-factory/concepts-integration-runtime#integration-runtime-types

Dataflow only supports Azure IR type and not Self hosted .
Below is feature requests logged in feedback forum and I request you please go and upvote or comment on the same .
https://feedback.azure.com/d365community/idea/8991a891-6d26-ec11-b6e6-000d3a4f032c
Please do let me know if you have any queries.
Thanks
Himanshu
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