Did you have a SSL-Inspection or other security Software/Hardware in your infrastructure? Does it work when you connect over a mobile hotspot over cell phone?
I have tried this in my lab as well so two totally separate environments, ISPs, etc and I get the same error with multiple accounts.
i can confirm that it not working anymore for me. it has worked a few weeks ago 🙂
This article discuss the same behavior: https://communities.vmware.com/t5/Dynamic-Environment-Manager/Cannot-access-Marketplace-to-get-DEM-T...
Thanks for the confirmation! I figured it wasn't just me 🙂
Would be nice to see an official response from VMware! I used those templates a lot.
This is a known issue, you need to download template.bin file and put it in the DEM environment folder on the same level as General folder.
Please follow this: https://kb.vmware.com/s/article/87966
You'll find the template.bin file inside the config-template-content at the bottom right of the page, or as a attachment here.