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Might be related to your URL settings - there are some 404 settings for groups and products out of context which could be the cause.

If you look at the 404 response header there might be a x-404-* header that explains the reason of the 404.

But it does look like we should do something to avoid those 404s

Where do I find the 404 settings for groups and products as you mention?

This is the response headers from the page:

These 4 can result in 404s:

Hello Nicolai,

- none of these settings are related to the 'GroupID' parameter in the URL, so I won't change any of these settings, because it will lead to other nasty errors in case of missing products.

I found the solution to get previews to work, even I'm not 100% happy about the solution.
PIM warehouse have the 'Preview page' setting. On the PIM product should I select my PIM warehouse in the field 'Shop'. Then will the preview function work.

Question: Once the product is published to Ecommerce, what impact would/could it have, that I have selected the PIM warehouse in the shop field?

Br. Michael Knudsen

That sounds like the "404 for products not in website shop" setting.

So if you try to preview a product on a page that does not have that warehouse published, the 404 will happen.

I can't expect PIM products are published to a Ecommerce warehouse, before the user wants to preview product data, so that's why I'm not 100% happy about the currect solution.

But still, if I remove the GroupId from the preview URL the product are shown, no matter if the product are published or have any default shop selected.

Should this case be reported to support?

Hi guys,

Is there any news on this topic? I see that the issue is still relevant even for DW 9.15.X

Thank you,

Adrian

Hi Adrian,

Not sure if it helps, but I just tested on a SWIFT 1.21 and a DW 9.15.7 - and now it seems to work on a solution that didn't have working preview before. 
A fix was released in:

Hi Kristoffer,

Thank you for the info.

My test was in 9.15.2. I will upgrade and retest.

Thank you very much.

Adrian