Hi @CSTX_a_KDEVESH ,
Thanks for using Microsoft Q&A forum and posting your query.
Is this an account created after 8/18/21 or before as the role assignments have changed from IAM store to Purview Studio (collections). So the recommendation is to make that service principal a collection admin at the root collection. This doc explains how to assign that data plane role.
Once that step is done, this error will disappear.
I am working with internal team to update the REST API document with latest info as the existing service principal should not make any difference.
Hope this info helps. Do let us know how it goes.
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