Failed requests from an Azure topic or subscription in random order

I use the Azure service bus (themes / subscriptions specifically) to send messages back and forth. Oddly enough, when sending a message to this thread, the message seems to disappear and no errors occur. If I look at the diagram on the Azure Management Portal for this topic, I see that some of the messages fail.

2 questions:

1 - Where is the documentation of what could lead to the failure of the request?

2 - How to log these requests so that I can see the error?

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