Fenix 7 deleted from Garmin databases

I have a Fenix 7 Silver purchased by my wife for me on February 2022.

Since mid November 2022 it did not upload the activities to Garmin Connect database.

You know the procedure: turn on and off Bluetooth, switch on and off the watch/phone, try with Android and IOS, try with Garmin Express, switch off the firewall, up the de-install everything and re-install + watch reset, including the activities.

Nothing worked.

I was on the phone with Garmin and they told me that the respective serial no (71D000xyz) and unit ID (3399958abc) do not exist in Garmin system !!!

The seller says it is not a counterfeit product and they bought it from Garmin. They said: "the watch entered Garmin stock on January, 11th 2022".

Garmin support notified this week but they have been silent, taking time is best.

Anyone having similar issues? Which was the resolution?

Thanks