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Please enable "Enhanced 4G LTE Mode" (VoLTE) IMS registration for Zenfone 5Z and Vodafone (Germany)

Star II
Please tell us some basic information before asking for help:
Model Name: Zenfone 5Z
Firmware Version: Android 10 /Version WW-
Rooted or not: original/not rooted
@asus Technical Team:
Please enable the Option "Enhanced 4G LTE Mode" for the VODAFONE Carrier in Germany too.
The option "Enhanced 4G LTE Mode" is not available @Zenfone 5Z and Vodafone says, they have enable VoLTE for my mobile number.
The codes @internet doesn´t help ( "Even though dialing "*#*#3642623344#*#*" mentioned here on the forums enables the "Enhanced 4G LTE Mode", - they do not seem to work. Even in the Phone info app (dialing "*#*#4636#*#*") shows VoLTE and VoWiFi as unavailable in the IMS Registration menu."
The adding of IMS for APN Type doesn´t help.
When i check the IMS Registration status it says: not registred and Voice-over-LTE: not available
I´m using the former flagship Asus Zenfone 5Z with Snapdragon 845 / 8GB RAM / 256GB storage and i "thought" it was worth to spend a lot of money... actualy i think i´ was wrong...

Star II

@ ASUS Support Team:
The Vodafone Support Team for Germany answered me today, that the Zenfone 5Z is not in their compatibility list for VoLTE (list from 24.07.2020) ->so the manufacturer ASUS has to change "something" =>please update the APN table for Vodafone (Germany) in the next "August" Firmware Update for Zenfone 5Z or please do similar corrections (activate IMS registry & voice-over-lte-availability etc. ...).
There are similar examples in the older updates:
Version WW-
"Updated apn table
- Removed Ventelo internet/mms APN
- Updated Sweden Tele2 APN"

Version WW-
8."Upgraded APN settings
1. Add the APN setting of Canada Public Mobile
2. Modify ASUS APN Setting"
Version WW-
2. Enable TWM Volte

OR: Do you have a functional workaround like the several *#*#123456#*#* codes for the Zenfone 5Z to enable the Enhanced 4G LTE Mode?

Community Legend II
Hi d.lemkau
I have forwarded the information to the relevant department. We will keep you updated and your consideration will be very much appreciated.

Community Legend II
Hi d.lemkau
Thank you for your waiting. After checking, ZS620KL is not supported by German carriers. Sorry for any inconvenience it may caused.