Have an address list whose users all have accepted pgp keys loaded in OpenPGP Manager that appear to meet all requirements, including email addresses in the key user IDs that match target addresses. When messages are sent to the individual users, Thunderbird encrypts successfully using these keys without issue. However, when a message is prepared to go to a list, OpenPGP Key Assistant claims "No key available." This occurs even if the list is reduced to a single, viable email address with corresponding pgp public key. What have I misconfigured or misunderstood? Please see screen capture. Thanks