got below error when i tried migrate pipelines with power shell module

Yes, UI does support and Power shell does not, however, Power Shell is recomended to use when we need to migrate in bulk or scripted migration or in soem CICD scenarios.

As quoted my MSFT in their article-

Power Shell migration makes sense when:

1) You want to script it(CSV/JSON) once and run overnight, UI will be manual.

2) The script can be parameterized for bulk loads.

3) For the smaller number of files, use migration assistants for the unsupproted file formats and when we have large number of files, we can use the hybrid approach of using Power shell for supported formats to load in bulk and the unsupported(Parquet/Avro) ones by UI.

Let me know if the above response gives you more insights on your query.

Please give Kudos if you like the response and mark it as solution if it solves your query/problem.

Thanks

Ati Puri