I installed a router MR6500V both internet and voice (VOLTE) works fine,
but if send any USSD command  returns this  error message "USSD terminated by ISP"
both 4G preferred and 3G fixed mode,  the ISP is TIM-italy, the SIM is 5G but here only receive 4G/3G signal,
the same SIM installed on the smartphone works correctly

what can I do,  thanks in advance

LOG for USSD command : *#21#

2025-04-03 07:43:50 [5] Httpd: Clear log.
2025-04-03 07:43:52 [6] LTE: ERROR: 0x00000010 QMI_ERR_NOT_PROVISIONED (this notice always appears every 5 sec.)

2025-04-03 07:44:13 [6] LTE: USER: Cancel ussd session.
2025-04-03 07:44:13 [6] LTE: ERROR: QMI VOICE Cancel USSD Failure

2025-04-03 07:44:40 [6] LTE: USER: Sending ussd request.
2025-04-03 07:44:40 [6] LTE: USER: Send origin ussd request successfully.
2025-04-03 07:44:40 [6] LTE: WARN: Event (0x10000001) not found its logic thread.

2025-04-03 07:44:44 [6] LTE: ERROR: 0x0000000D QMI_ERR_NO_NETWORK_FOUND
2025-04-03 07:44:44 [6] LTE: ERROR: result=1, error=13
2025-04-03 07:44:44 [6] LTE: ERROR: QMI NAS Get cell location info failed, ret = 0.

2025-04-03 07:45:09 [6] LTE: USER: Now receive the ussd orig response.
2025-04-03 07:45:09 [6] LTE: ERROR: QMI VOICE Orig USSD RESP failure_cause = 218
2025-04-03 07:45:09 [6] LTE: ERROR: USSD Failure: error_code = 92

2025-04-03 07:45:11 [6] LTE: ERROR: 0x00000010 QMI_ERR_NOT_PROVISIONED