After Bulkupload showing audience too small in the customer match list

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When I upload thousands of profiles via API into any of my Audiences, the status is still showing "Audience too small".
A sample look of my csv is like this. I dont get any errors back.

Type,Status,Id,Parent Id,Client Id,Modified Time,Name,Description,Scope,Audience,Action Type,Sub type,Text

Format Version,,,,,,6.0,,,,,,

Customer List,,8831344,,,,,,,,Add,,

Customer List Item,,,8831344,,,,,,,,Email,ec4ca2f39cdaa59da6b7b70b04ff50195986bc6725dbb7ee0d2c08ee66721eee

Customer List Item,,,8831344,,,,,,,,Email,7994148579a43e82670afee21a67dc194e70b5a22bf15d82e302726d7cad8c31

Anyone kindly helps me point out what the issue is?

Microsoft Advertising API
Microsoft Advertising API
A Microsoft API that provides programmatic access to Microsoft Advertising to manage large campaigns or to integrate your marketing with other in-house systems.
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