Problema con migración de Yahoo a Zoho Mail

Problema con migración de Yahoo a Zoho Mail

Buenas!
Tengo un problema a la hora de migrar la cuenta de correo de Yahoo a Zoho mail. 
Lo he probado con IMAP  y con POP y nada, cuando añado el usuario para empezar la migración, aparece un error de identificación del usuario de origen. He verificado la contraseña y está correcta.

¿Se sabe a qué se debe o es que estoy haciendo algo mal?

Gracias de antemano.

Un saludo.

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