Internet Explorer Blocked

Possibly your solution is to install Creative Cloud first, even if you don't use it. That worked for me.

I have posted this to the Adobe User Voice to have this changed in a future release: Stop using Internet Explorer for application logins – Share your feedback on Acrobat DC

Perhaps I wasn't clear enough, I'm not talking about the user accessing a website.  I am talking about when the user launches say Adobe Acrobat and needs to login for their license to apply, that process uses Internet Explorer as it's browser, we have IE blocked at the firewall.

So my question is is there a registry key or some other way to force the in-app sign-in process to use a different browser instead of IE?  If not, is anyone aware of if this is on a road map for a future version?

Your default browser  is determined by your computer's operating system, not Adobe Creative Cloud,  In fact Adobe CC is compatible with all modern desktop browsers.  See screenshot.

For details on chancing browsers, do a Google search for [your operating system]

default browser.

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Can anyone advise whether there is a way to make Adobe use Edge or a chromium browser for its sign-in process?

That's a user preference set by either the end user or the network administrator.

Does your organisation's firewall block all internet access for all browsers?