Open Web RX Raspberry ZeroTier install

Hello, Trying to install ZeroTier on my raspberry pi400 under OpenWeb RX RPI4 image (debian) I input this command :
curl -s ‘’ | gpg --import && \
if z=$(curl -s ‘’ | gpg); then echo “$z” | sudo bash; fi

then it says : -bash syntax error near unexpected token ‘then’

Could you please help me with that ?