I can`t open the messenger Signal in my AppVM "multimedia-debian"

I installed successfully the messenger Signal using the terminal in my TemplateVM debian 11.Following these instructions. which you can find on https://signal.org/de/download/# .

1. Install our official public software signing key
wget -O- https://updates.signal.org/desktop/apt/keys.asc | gpg --dearmor > signal-desktop-keyring.gpg
cat signal-desktop-keyring.gpg | sudo tee -a /usr/share/keyrings/signal-desktop-keyring.gpg > /dev/null

# 2. Add our repository to your list of repositories
echo ‘deb [arch=amd64 signed-by=/usr/share/keyrings/signal-desktop-keyring.gpg] https://updates.signal.org/desktop/apt xenial main’ |
sudo tee -a /etc/apt/sources.list.d/signal-xenial.list

# 3. Update your package database and install signal
sudo apt update && sudo apt install signal-desktop

However now I can only open Signal in my TemplateVM “debian 11” and not in my AppVM “multimedia-debian”, where I want to use it.
So please tell me the terminal command I can use to start Signal.
Please help me.

Thank you very much.

Stay healthy & safe.

Best Knut by Walter