Sim7000g mqtt tls

Hi,

I hope somebody here can help me.
It is hard to find people who know stuff like this.

I am trying to set up an SSL MQTT connection with a SIM7000G module.
The module supports MQTT with AT-commands.
Everything works as aspected for the non secured version.

For the secured version I have to set the certificates.
I am stuck with the convert command.

See my output below:
(the certificates are not completed…)

AT+CFSINIT

OK
AT+CFSWFILE=3,“ca.crt”,0,1218,10000

DOWNLOAD
-----BEGIN CERTIFICATE----- 1ir/md2cXjbDaJWFBM5 JDGFoqgCWjBH4d1QB7wCCZAA62RjYJsWvIjJEubSfZGL+T0yjWW06XyxV3bqxbYo Ob8VZRzI9neWagqNdwvYkQsEjgfbKbYK7p2CNTUQ -----END CERTIFICATE-----

OK
AT+CFSWFILE=3,“myclient.crt”,0,764,10000

DOWNLOAD
-----BEGIN CERTIFICATE----- vRslsNDSjH0ev8cqyTl 82HNoYfLzXVIU9V9xhdIprrMhGewWb4G4NgzMi1MggkB/0GJL3qPlUXIpdwBYC9d umlYSvZKapblSqSYfZBfK7RvRNNM3/Pq3IAG2TsWEqgE8g== -----END CERTIFICATE-----

OK
AT+CFSWFILE=3,“myclient.key”,0,930,10000

DOWNLOAD
-----BEGIN PRIVATE KEY----- 4mcNibfp9qw72Lu4EIPOCvl/SMCQFyz8zUk noLTr7b0GbfhxIpfc56gzIti0lHCFdm2R0xz6XzJnt50Qn7VOZRLSMK0NhSBEcBe a1SWwUgZp0B6eFc= -----END PRIVATE KEY-----

OK
AT+CFSTERM

OK
AT+CSSLCFG=convert,2,ca.crt

OK
AT+CSSLCFG=convert,1,myclient.crt,myclient.key

+CME ERROR: operation not allowed

Anybody who has experience with this?