Round cube worked on PHP 8.1-fpm but not on PHP 8.3-fpm

[mary4]

i cannot get roundcube working on sending emails on version php 8.3-fpm but it worked perfectly on version 8.1-fpm

i really need help with this

here is the errors from the error logs
[08-Jun-2025 15:50:53 -0400]: <ich4ro8d> PHP Error: Invalid response code received from server (POST /roundcube/?_task=mail&_unlock=loading1749412248926&_framed=1&_lang=en&_action=send)
[08-Jun-2025 15:50:53 -0400]: <ich4ro8d> PHP Error: Invalid response code received from server (POST /roundcube/?_task=mail&_unlock=loading1749412248926&_framed=1&_lang=en&_action=send)
[08-Jun-2025 15:50:53 -0400]: <ich4ro8d> SMTP Error: Authentication failure:  (Code: -1) in /var/www/html/roundcube/program/lib/Roundcube/rcube.php on line 1799 (POST /roundcube/?_task=mail&_unlock=loading1749412248926&_framed=1&_lang=en&_action=send)

on latest stable version btw