Signature Error While Fetching from MySQL Repo during apt-get update

Receiving a signature error when I run sudo apt-get update. It seems a key is missing or unverifiable while fetching from the MySQL repo. Any insight on how to resolve this error?

W: An error occurred during the signature verification. The repository is not updated and the previous index files will be used. GPG error: http://repo.mysql.com/apt/ubuntu focal InRelease: The following signatures couldn’t be verified because the public key is not available: NO_PUBKEY 234B234DA54BD29 W: Failed to fetch http://repo.mysql.com/apt/ubuntu/dists/focal/InRelease The following signatures couldn’t be verified because the public key is not available: NO_PUBKEY 234B234DA54BD29 W: Some index files failed to download. They have been ignored, or old ones used instead.