IPv6 dual stack on LTE (LHGG LTE6 kit)

RouterOS Beginner Basics
1

Hi Everyone,

I have purchased the LHGG LTE6 kit (RBLHGGR&R11e-LTE6) and so far, the device is amazing.
The setup was very easy using the Quick Set function. I updated the package & firmware to 6.48 and the LTE modem firmware to R11e-LTE6_V026.

However, I am struggling to get IPv6 working.
I can tell for sure, that my mobile phone carrier Vodafone (Germany) is providing dual stack by using the AVM Fritzbox 6850 and 6890 LTE. This is easily achieved by selecting 3GPP Release 8:
fritzbox7850_LTE_IPv6_settings.png
Is there anyone who has and idea how to get dual stack up and running when using LTE on Mikrotik devices?

So far, I selected ipv4-ipv6 in the APN settings and set the IPv6 Interface to LTE1 or ETH1 - but did not receive any IPv6.
I applied standard firewall rules described in the Mikrotik confluence / wiki but that didn’t make any difference whatsoever.
When trying to query via at-chat, I always get an error. Not sure if this is normal, but the internet works fine (via IPv4).

[admin@MikroTik] > /interface lte at-chat lte1 input="AT^NDISSTATQRY\?"
  output: ERROR