The Quixel sign-in option will work only for Legacy users that already have an existing Quixel account.
For new users who registered or signed up for a subscription after Nov 12, 2019, their account creation will be re-directed to Epic Games' server, and they will be able to log in via the "Sign in with Epic Games" option only.
So if you're getting the below warning on trying to sign in with Quixel, try signing in with Epic Games instead.
I was looking for help as to whether using Epic Games sign-in meant that I would be tied to Unreal Engine projects during my use of Quixel Mixer. But I see that Epic Games sign-in is standard for all new subscribers.
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