An error occurred during the signature verification

I’m beginning to see this on several Ubuntu machines (18.04.LTS and 20.04.LTS):

I’m assuming the key changed?

W: An error occurred during the signature verification. The repository is not updated and the previous index files will be used. GPG error: https://download.jitsi.org stable/ InRelease: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY B4D2D216F1FD7806
W: Failed to fetch https://download.jitsi.org/stable/InRelease  The following signatures couldn't be verified because the public key is not available: NO_PUBKEY B4D2D216F1FD7806
W: Some index files failed to download. They have been ignored, or old ones used instead.

We have rotated the key, please download the new key and install it (same place as before) and you’ll be back up.

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