Obviously. This is Adobe Creative Cloud telling me that Adobe Creative Cloud REQUIRES "Internet Explorer 11 or later" In order to authenticate the creative cloud license.
When will the need for Explorer 11 be corrected, and/or when will the text of the authentication error message be corrected to no longer give the impression you must have Internet Explorer 11 installed in order for Adobe Creative Cloud to authenticate your license?
I'm as perplexed as you, but it's in the Adobe error message. If I can get it to pop up again I will screen shot it and try to post, or at least give the full text of the licensing error.