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Neutral sites not working in cloud site list
So here's a strange one. We've added a specific SharePoint site (example, company.sharepoint.com/teams/12345) into the IE mode site list since it is using legacy Active X controls. When navigating to...
I'll pass your suggestion on to the team. Thanks! 
Kelly_Y
Microsoft
Microsoftlexcyn Hello! Have you confirmed the correct sites are configured as neutral sites? https://docs.microsoft.com/en-us/deployedge/edge-ie-mode-faq#incomplete-neutral-site-configurations
Also, have you checked if this a case where it is necessary to configure specific shared cookies? Cookie sharing between Microsoft Edge and Internet Explorer | Microsoft Docs Thanks!
-Kelly
Thanks Kelly_Y - you know what, I was looking over the link you sent about net-export but I think I found an easier way (you should update that with this method!) and I got it working:
- Load up Dev Tools/F12
- Go to the Network tab
- Enable "Preserve log"
- Sort "Waterfall" by descending/last first
- Load the website you are testing
- Compare the URLs at the top of the list with neutral sites to find one's that are missing
I ended up adding company.sharepoint.com/_forms/default.aspx into neutral and now its working as expected.