That mostly happens if you created the yahoo accounts with a poor quality (spam identified) IPs, such as data center IPS or (and) logged in from a different country IP as compared with the country IP of account creation. Use residential proxies to create them.
@junior04
I also face this problem. According to my "info" yahoo probably implemented new antispam system like a week ago. That's not related to IPs (I use self-made 4G). They (Yahoo) probably investigate some footprints after account creation and ban accounts. Accounts older than 14 days are not affected on my end.
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