Is it sent from yahoo?
Prior to Yahoo! Agreement
"Starting from the 25th day of Nov 2020, YAHOO! customers who have not updated their email account will no longer be able to log in to their Yahoo and through email addresses.
Customers will have to Verify their email address to confirm, kindly Download the attachment to re-login and verify now!
This is to improve our service quality. We apologize for any inconvenience caused.
Property: Account Security
Yahoo! member services