"signing_config.v0.2.json": target signing_config.v0.2.json not found

[13567436138]

root@ubuntu:~# cosign initialize --mirror=$TUF_SERVER_URL --root=$TUF_SERVER_URL/root.json
WARNING: Fetching initial root from URL without providing its checksum is deprecated and will be disallowed in a future Cosign release. Please provide the initial root checksum via the --root-checksum argument.
WARNING: Could not fetch signing_config.json from the TUF mirror (encountered error: getting info for target "signing_config.v0.2.json": target signing_config.v0.2.json not found). It is recommended to use a signing config file rather than provide service URLs when signing.