please export NM_PPP_DEBUG=1 before running modemmanager and attach the full output again (with all up to date) ... also run the mm-test.py from the build tree i gave you and post the output
please export NM_PPP_DEBUG=1 before running modemmanager and attach the full output again (with all up to date) ... also run the mm-test.py from the build tree i gave you and post the output