OTP for Yahoo Mail received from two unknown sources

[writer55]

I had cleared all the cookies in my computer yesterday (Dec. 7, 2021), and today when I tried to login to Yahoo Mail, it asked to enter the OTP sent to my mobile phone. Unbelievably, the OTP came with an unrelated text header, and not from a numbers header (which email service providers Yahoo and Gmail typically send the OTP with).  When I clicked Resend OTP, the same OTP came again, but this time from a phone number.  I was concerned and opted to receive the OTP on my recovery e-mail.  I was then able to login to my Yahoo Mail.  I downloaded Malwarebytes thereafter and scanned my computer, but it didn't report any threats.  What is happening?  Please help.

[Porthos]

I think you are reading too much into this. The first text was probably legit and so was the second.

[Firefox]

I agree, companies such as this have more than one way to send the requested code, both were probably legit.