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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?
I had the same issue because the Link was not updated. Try to check in your Links palette if there is the exclamation mark and in case, select the item and refresh it.
Check to see if the image frame and the image itself are both scaled. I had the same issue where the frame was at about 10% and the image was scaled inside it. I think this only occurs if you use the 'Adjust Scaling Percentage' preference.
'Redefine scaling as 100%' will fix the problem. This is hidden in the fly-out menu of the Object palette or Control palette.
Looks like someone on the 'Publish Online' team didn't do the maths correctly.
Some images can be improved by going to Object menu > Object Export Options > EPUB and HTML tab. Set "Rasterize Container" to a higher resolution. Good write up on this here: https://indesignsecrets.com/controlling-publish-online-image-resolution.php
Sorry, just caught I had already suggested this, and it apparently didn't work for you.
I did have a case recently where I wasn't happy with the image quality and I published the project at 144 HiDPI in the Advanced Options of the Publish Online dialog. It helped improve the quality and it was acceptable.
I don't like to use this option, especially on bigger docs with a lot of interactivity as it can interfere. But in my case it was largely a slideshow of images and worked fine.
What is the initial resolution of the images? Have you considered observing the actual resolution and effective resolution of your images in the Links panel?