@Defaultuser do you have the plugin nodebb-plugin-dbsearch activated?
I believe links to email confirmation expire after certain time (need to confirm). Create a new user and try to verify it right away.
I activated the search plugin. It works.
I made a test account and still get that error. Also my admin account gets this error. I sent receive the email as soon as I login and the pop up asking to confirm it.
*Edit trying to replace the nodebb logo in settings ends up have my logo and nodebb, where is the is the nodebb logo so I can replace it?
Final update, it worked on the production server!! so now our forum is working properly sending emails the Linux way on a Windows Server OS, quite nice I would say, just as a side note our forum is actually really small in number of users, as it is an internal forum, so I can't assure this setup will work out to other forum's expectations or needs, also I would like to add that this shouldn't be the way to do it on Windows as it is kind of a weird way to handle it so in later versions it would be nice to see it reworked or polished for Windows environments (especially because it looks like the program used to simulate sendmail on Windows is no longer receiving maintenance).