No RekeyConf on RekeyInd sent

Hi there,

We have a Lorawan 1.1 device joining and sending uplink on chirpstack v4.9.0.
The device uses a Lorawan 1.1 device profile.

After sending 64 uplinks, device stops sending because the chirstack server didn’t answered a RekeyConf within the 64 first uplinks.

Here is on this screenshot we can see the device is sending a RekeyInd option :

Parameter regions.network.rejoin_request is disabled (seems to have an impact on this).

What is going wrong for chirpstack not responding the RekeyConf message ? Is I missed something in the conf ?

Many thanks.