Com o contexto adicional, vê-se que se trata de condições ou estados disponíveis com o software de administração NEM. A atividade de consulta ("polling") é uma das mais comuns em administração de tráfego de rede, e requer uma resposta válida ("successful callback") se não, de nada adianta. A condição referida indica precisamente uma tal falha:

MAC poll callback failed

(houve) erro de resposta a consulta na camada MAC

Geralmente é possível adaptar a sintaxe da tradução em português, a fim de que não seja necessário o verbo "houve" (da mesma forma que, em inglês, poderia ser "MAC poll callback failure").

English term (edited): MAC poll callback failed

I am progressively becoming less rigid with translating and interpreting assignments in terms of compatibility of length.
Because I watched an Asian doing interpretation very calmly and speaking some ten times more, in terms of time and words, than the AU native nurse had spoken when interpreting for a fellow of his, I have learned that we can do it, basically.
If we really want to translate things, rather than doing what people usually do in Brazil, which would be saying 'o callback do MAC nao funcionou', then we can only do this way.
Notice that this is about programming and anyone in Brazil doing this language would know what a 'callback function' or a 'polling' is, so that if you are translating this for programmers, then they would not be shocked if you did things the way I have just described.
I however do defend translating everything that you can translate and I reassure you that 90% of the IT people do not really understand the meaning of the words and functions they use every day, so that it is also worth it translating all.
For matters of ethics, you should add a note as you opt for my suggestion because they need to be able to connect this to the commands they know.