Sonarr public key is not available

Trying to install Sonarr on debian 11, ran into the following, many thanks in advance for any help.
GPG error: https://apt.sonarr.tv/debian buster InRelease: The following signatures couldn’t be verified because the public key is not available: NO_PUBKEY EBFF6B99D9B78493 NO_PUBKEY 1F4F90DE2A9B4BF8
E: The repository ‘https://apt.sonarr.tv/debian buster-develop InRelease’ is not signed.
N: Updating from such a repository can’t be done securely, and is therefore disabled by default.

I’m thinking you didn’t follow the installation instructions and missed the step of adding the key?

The message appears doing apt update. apt-key is depriciated in Debian 11 so I am having dificulties properly importing sonarr key which I think caused apt update to fail with the message ‘not signed’.

not the issue apt-key is still supported in debian 11

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