URSALINK: join duty_cycle_restricted

Dear all,

I have a URSALINK EM500-PT100-868 device and cannot connect it to TTN. I get the following error:

===== MLME-Request - MLME_JOIN [2]====

STATUS : Duty-cycle restricted
===join duty_cycle_restricted, set peiod 139984
===rejoin TxDutyCycleTime = 139640

I have entered the LoRaWAN keys correctly and the authentication is OTAA.

Can you help me?
Thanks!