Mkrwan1310 ttn Something went wrong , but message send correctly

Good morning

I created my application with the correct dev eui and
but after the following instruction:

int ret = modem.joinOTAA(appEui, appKey);

Have you ever received rets of 0, meaning the connection is not being made?

if then, I force the sending of messages, they sometimes arrive, so I deduce that the connection must be established, but never ever do I get confirmation of connection
Do you know where the problem could come from, if ever?

thanks in advance

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