Email invitation for user is not working

ERPNext: v12.3.1 (version-12)
Frappe Framework: v12.1.0 (version-12)

I am able to create new user from user doctype but user invitation is not going.
I have ticked ‘send welcome mail’ check box but result is the same. infact i’am not getting any type of notification. if it is working it should show ‘Welcome email sent’.

I tried removing email account which i have already set so that i will get the notification to Setup Email. But even that notification also not working.

Can anyone help me on this ? or Is that a bug ?
because previously it was working fine for me when it was running on version 11 and after upgrading to v12 i’m facing this issue.

its fixed and merged in the hotfix and develop branches. WIll be a part of the next release of version-12


thank you