How To Close An Activision Account When Someone Dies

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

How to make an Activision account

How to Change Your Name in Call of Duty ✔️ MWII and Warzone Guide

Steam Community :: Guide :: MW19: Activision Account, Crash fix, DLC gb size, CP transfer, Platforms, Ghost Pack and more.

So Activision allowed my account to be hacked, what's next? : r/modernwarfare

Keeping your Activision Account Secure

Updated] Activision Claims There Is No Activision Account Hack

Activision Denies Reports That 500,000 Call Of Duty Accounts Have Been Hacked

I can't sign in for a activision account because of user, any fix? (ps4) : r/modernwarfare

how to change to a different activision account｜TikTok Search