Bitmessage Installation

Hi there, I am new to Qubes-Whonix. atm I have problems installing Bitmessage as described in the Whonix-documentation.

With Bitmessage, " 2. Download the GPG public key of Pete Šurda, BitMessage core developer." does not work. It says “new key but contains no user id”. Switching keyserver to keys-openpgp-org does not work. I don’t know where to download the key elsewhere.

Would be very thankful for any help!