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O redisConfig não consegue entender o host e a porta configuradas, da forma que está passando no construtor. No seu código funcionou, pois o redis estava no docker e mapeou pro 127.0.0.1, e então, ele entendeu o host padrão. Peguei esse erro quando tentei fazer um container ler o redis de outro container, e neste caso, meu host do redis se chamava "redis". Pra arrumar, deve passar a url da conexão, dessa forma:
de:
const mailQueue = new Queue(RegistrationMail.key, redisConfig)
para:
const mailQueue = new Queue(RegistrationMail.key,
redis://${redisConfig.host}:${redisConfig.port}
)