I’m using Thunderbird 78.1 on a Debian testing, with Cardbook 62.1. I have two Cardbook address books: a local one, originally imported from the local TB address book, and a CardDAV one, created as a remote address book in Cardbook (from a Sogo data source). The latter is intended to be my main (and ultimately only) source of contact data.
However, when I compose an e-mail, I see only contacts from the local address book (via Cardbook though). I would also like to see contacts from the CardDAV address book. If I disable (“désactiver”) the local address book in Cardbook, then I fall back to the TB address book and don’t get any info from any Cardbook address book.
Apart from one being a remote address book and the other being basically a clone of an existing TB address book, the settings on both address books are similar. Cardbook is set as the sole source of contact information (first checkbox in the settings).
I could swear that in the past (older versions of TB and/or CB) I was able to get contacts from both address books when composing a mail…