Hi @Martin
Thank you for your query regarding the compatibility of the Mongo DB and Mongo DB Atlas connectors with higher than 4.2 versions of Mongo DB.
As per the Azure documentation, both connectors are currently incompatible with higher versions than Mongo 4.2. Unfortunately, there is no information available on when compatibility with higher versions will be implemented.
If both connectors are incompatible, then it is not possible to use the Copy Activity of the Azure Data Factory with higher versions than Mongo 4.2.
Hope this helps. Do let us know if you any further queries.
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