Background service to consume a rabbitmq queue, messages unacked

I have a background worker which listens to a rabbitmq queue for email sending. The messages are added to the queue by an api. The full code of the service is available at : https://pastebin.com/nArbQd2g (I also have a similar service to process data for firebase notifications) When I push some messages into my local queue and run the service connected to the local queue, the mails are sent, so everything works on my local computer. But when I switch to the remote queue (a free instance on cloudamqp), the messages are still pushed to the queue but when I run the service on my computer, the Received event is never triggered and in he dashboard, I have noticed that the messages were ready but have been unacked (you can see it in the attachment). I have removed the second service that is listenning to the same host but I have the same issue

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