RM510Q-GL doesn't connect to 5G

Hi,

is it possible to use the RM510Q-GL to connect to public 5G networks in Germany?
With a 5G capable SIM card from the Deutsche Telekom (262-01) there are no established 5G connections, even with multiple parallel downloads, although 5G does work with other smartphones and modems at the same locations.

The RM510Q-GL always stays in EN-DC mode:

at+qeng="servingcell"
> +QENG: "servingcell","NOCONN"
> +QENG: "LTE","FDD",262,01,57911A,48,1600,3,4,4,55F2,-107,-16,-71,6,0,-32768,16
> +QENG:"NR5G-NSA",262,01,65535,-32768,-32768,-32768

The values for NR5G never change.

Sometimes the AT command even returns just an ‘OK’ without anything else:

at+qeng="servingcell"
> OK

Why does this happen?

It would be great if you could help me with some information regarding this topic.
Thanks.

Br,
Yuri