Thanks, Rober and Lucian,
@robert681 , the latest release of WP 2FA (2.8) unfortunately won’t solve my issue.
@lucianwpwhite , you’re right! I’ve noticed that Theme My Login versions 5.x and above aren’t compatible with WordPress. That’s why I’m using Theme My Login version 6.4.17, which works with WordPress 6.4.3.
I’ve also reported this same issue to the Theme My Login developers but haven’t received a response yet. I’ve attached the link Fatal error: Uncaught ArgumentCountError: lostpassword_post() | www.ads-software.com.
It would be fantastic if we could find a solution for this.