Have you set up your SMTP server settings in the Joplin server environment variables?
If so, did your SMTP settings work before v2.7.4? There was a recent post for v2.7.4 where one of the environment variables for setting up SMTP changed to MAILER_SECURITY=.
However when testing Joplin Server I rarely configure SMTP and just leave it switched off (the default). When I create user accounts (and set their password at the same time) the user account can log in and sync without needing to click anything in a confirmation email.
If you still want to confirm the account but without email, the admin can login and go to the email tab and select the message.
It will display the link, which can be copied and used manually.
