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Call of Duty: Warzone In-Game Account Registration

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So I just got warzone, and I need to create an Activision account, as this is the first time it's required. I try to enter in my information, but it says invalid

Account Registration Error: 0

I'm trying to make an activision account and it keeps saying invalid user. But doesn't ask for a username. Solution? : r/Warzone

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Warzone Mobile™ on X: Link Your Activision Account ( Warzone Mobile Login ) To Obtain #CODnext Watch And Earn Rewards / X

AstroCat Gaming - Tag or share this with a friend! Did y'all know if you have prime you can link your Activision account and get free rewards? I just claimed this