PC & phone stopped receiving mail


New Email
Over the past few days both my PC & phone have stopped receiving mail from my Sky Yahoo e-mail account. These are 2 different unconnected devices (PC & phone), using 2 different e-mail clients (Thunderbird & K9 mail) & 2 different operating systems (Win10 & Android). Both stopped receiving mail at about the same time & both report password errors but I can log into the Yahoo account & see mail using the same password. I have checked the password on both devices. Both PC & phone were receiving mail properly before this happened.

Does anyone have any idea what might have happened & how I can fix it?