Yahoo has been notorious for bouncing emails due to a company wide initiative started in March of 2019 to disable, delete and then release email accounts that were inactive for more than 12 months. Once an account was marked as inactive it could later deleted, after 30 days the ID could then be reused by someone else.
For more information on why Yahoo emails bounce and possible solutions, check out the below article from an email scrubbing solution.
https://blog.zerobounce.net/2019/03/28/yahoo-emails-bouncing-here-is-why-and-what-you-can-do/
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