i've had a few issues with windows 10's security when i bought a new computer. didn't have any issues with the older computer i'd upgraded to w10, but the brand new one was temperamental. microsoft seems to take joy in blocking a lot of things they don't really need to. gmail was initially blocked for me. i guess because my spam folder might contain dangers...
I got another email from the 'Yahoo email account team' that my account was being disactivated. If it already had been, click on the link to reactivate it (don't ask how one gets into a deactivated account). It says not to respond to the email, just click the link. The subject is "EMAIL." When you hover your cursor over that, it says: carrisam13@comcast.com, which is exactly the email address that I would expect Yahoo corporate to have. It surprises me they do not have a filter to catch people right out of the gate using the Yahoo name.