Public key error when adding flatpak remote

[barn]

When attempting to add the endless flatpak remote, I get an error similar to the following when trying to run either of these commands to add the flatpak remote:

$ flatpak remote-add --if-not-exists eos-runtimes https://ostree.endlessm-sf.com/ostree/eos-amd64

$ flatpak remote-add --if-not-exists eos-apps https://ostree.endlessm-sf.com/ostree/eos-apps

error: Signature made Mon 25 May 2020 04:41:41 PM CDT using RSA key ID FCF17B17F1F8E157
Can’t check signature: public key not found

Note: I am using Fedora Silverblue, which is why the public key is not preinstalled. I am hoping to get access to some of the great flatpaks that have been developed by the project.

Help appreciated!

[LeandroStanger]

@barn

Note: I am using Fedora Silverblue, which is why the public key is not preinstalled. I am hoping to get access to some of the great flatpaks that have been developed by the project.

Only Endless OS is supported