LTE link monitor does not work with nRF9160D DK. Why?

LTE link monitor does not work.

OS: Mac
place: Tokyo in Japan.

I set up the environment from scratch following Get Started Assistant v0.9.2, updated firmware to 0.7.0-15.alpha, and then activated SIM card.
I'm using v0.4.0 of nrf repository, the latest one.

It was weird that even though README.rst file explains I should run: pip install nrf9160_mdm_dfu-0.10.1+dev-py3-none-any.whl, but there is only nrf9160_mdm_dfu-0.10.0+dev-py3-none-any.whl, instead of nrf9160_mdm_dfu-0.10.1+dev-py3-none-any.whl. I installed nrf9160_mdm_dfu-0.10.0+dev-py3-none-any.whl.

After that, I built and run at_client program to a nRF9160DK and it was successful.

Finally, I installed LTE link monitor v0.9.1, but there is no response and always timeout happens. 

Can anyone give any advice? Thank you in advance.