Garmin Connect/Garmin 935 does not shows the "altitude gain" a virtual Zwift activity

Hello all,

Hope you can help here.

I have recently purchased a home trainer (Tacx Neo 2T - a Garmin company since a few Months).

I am also using Zwift as the app to perform my rides. 

My set up:

• My Forerunner 935 is connected to the Neo2T (cad/spd/pwr...).
• My Neo2T is connected to my laptop over Bluetooth for Zwift. 

After an activity, it is uploaded from Zwift to both Garmin connect & Strava.

In Strava, I can get everything - including correct elevation.

But in Garmin connect, the gain of elevation is empty (rest is OK).

Does anyone experience the same issue? how to fix it?

Thanks!

X.