We were unable to create your brand/library. Please confirm the inputs and try again.

Hey @MagicApproach, Welcome to our Adobe Express Community! 

I tried reproducing this on multiple browsers and devices (all that you mentioned), and it worked fine. Can you please retry once after confirming that all browser extensions/plugins are disabled and clearing their cache/cookies? You may also want to try from an incognito/private browsing mode and switching to a different internet connection to see if that makes any difference. 

Also, what happens when you enter any text under 'Your Brand Name' and hit create? Can you share a screen recording of the workflow with this error pop-up? It will help us investigate the issue. 

Please share your observations!