Http:// 403 Forbidden

When added manually to it’s own sources.list in the apt folder I get a 403, trying over HTTP in a browser I get:

403 Forbidden

    Code: AccessDenied
    Message: Access Denied
    RequestId: B61AC472319D4695
    HostId: 120/T1tNzS4LFhhmAlzYn5pagILiAfUHOGWhIkQCZ9gpFCQRdnAj28p05FQL+BPJaubQEn191D4=

Trying with sudo add-apt-repository -y deb bionic main as per I get:

Error: need a single repository as argument