I finally got a chance to fix the user registration. I just made use of the Network Subsite User Registration plugin. There are other posts about making the modifications yourself but this worked and makes things simpler. There was also an issue with the WordPress mailer on Debian. Turns out WordPress uses a modified version of phpmailer that was interfering with Debian supplied (and required) package libphp-phpmailer. Here’s the fix:
*** class.phpmailer.php.orig 2018-12-01 14:09:47.000000000 +0000
--- class.phpmailer.php 2020-01-01 22:00:47.817057652 +0000
***************
*** 1492,1497 ****
--- 1492,1498 ----
public function getSMTPInstance()
{
if (!is_object($this->smtp)) {
+ require_once( 'class.smtp...Read More