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Try setting higher resolution or change to JPEG or PNG in Object > Object Export Options. See more in this article: https://indesignsecrets.com/controlling-publish-online-image-resolution.php
Hope that helps.
Tested everything.. Doesn't work for me :/
Can you post a link to a Publish Online page with an example of the blurry images?
Possible to message me with one of the problem image files?
Hard to troubleshoot further without seeing the actual example.
Did you change the Object Export Option also in the Object Styles?