PHPMailer not working on Bitnami Lightsail instance running Wordpress

I'm running Wordpress on a Bitnami Lightsail instance.

I've opened all TCP & UDP ports (for troubleshooting purposes) and am receiving errors when trying to use PHPMailer with any mail plugin.

Any help appreciated. I've pasted my error log below:

Versions:
WordPress: 6.3.1
WordPress MS: No
PHP: 8.2.10
WP Mail SMTP: 3.9.0

Params:
Mailer: mail
Constants: No

Server:
PHP.mail(): Yes

PHPMailer Debug:
Could not instantiate mail function.


Debug:
Email Source: WP Mail SMTP
Mailer: Default (none)
PHPMailer was able to connect to SMTP server but failed while trying to send an email.