ModemManager sim-missing error for Sierra EM7565

[Thomas Schäfer]

Am Dienstag, 8. Juni 2021, 21:00:41 CEST schrieb Amardeep Manak:
> Hello
> 
> So I am trying to test Sierra EM7565 using modem manager. I am using Debian
> 9 (uname -r: 4.9.0-13-amd64) and the version of modem manager is 1.6.4.

I afraid 1.6.4  is probably to old. 
maybe debian 9  too
( 9 Stretch 2017-06-17 2020-07-06 ~2022  https://wiki.debian.org/LTS )