Possible Results:
estabas chateando
-you were chatting
Imperfect progressive conjugation of chatear.
estabas chateando
-you were chatting
Imperfect progressive vos conjugation of chatear.

chatear

En otras palabras, si estabas chateando en WhatsApp en el momento en que se envió el mensaje, probablemente no se haya creado una notificación.
In other words, if you were chatting on WhatsApp at the time the message was sent a notification will probably not have been created.
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Christmas carol