When issue occur with Design Review diagnostic and compatibility information can obtained using the following steps and sources. They can then be added to support requests when created.
Within the Design Review session a diagnostic report can be accessedd that will give relevant information about the current browser setup. The report can be saved to a file or the text can be copied to the clipboard.
The iTwin compatibility checker site will show what WebGL components are active along with browser information and graphic renderer type.
If requested this information can be saved for review by going the the link then using right click Save as. This will save the page to an html file that can sent to support.