I created a new DC account using my main e-mail account: username@domain.com.
Recently I changed ONLY the e-mail address: alias@domain.com
Then I added a new contact ( I scanned the qr code I received via another channel etc.) and we obtained a green check mark.
Today I exported private key from the phone to read messages on Thunderbird - it works btw.
I realized that the key is not generated for the changed e-mail address i.e. alias@domain.com
The key did not change. >!!!The key id is for username@domain.com!!!<
Subject: …
From: xxx@xxx.xxx
To: alias@domain.com
…
Chat-Version: 1.0
Autocrypt: xxx; prefer-encrypt=mutual;
…
MIME-Version: 1.0
…
Content-Description: OpenPGP encrypted message
Content-Disposition: inline; filename=“encrypted.asc”;
Content-Type: application/octet-stream; name=“encrypted.asc”
-----BEGIN PGP MESSAGE-----
…
-----END PGP MESSAGE-----
gpg: encrypted with 256-bit ECDH key, ID XXXXX, created 2023-XX-XX
“username@domain.com”
I deleted the account and set up again an account for alias@domain.com - now the key is for alias@domain.com