The lsw_absence application sends e-mails with wrong links to the absence request, ie.
https://https://www........
As one is free in choosing between http and https for rei3 service, I think the problem is the e-mail templates assuming https connection and ignoring the fact the config.publicHostname contains the full address.
The e-mail templates in lsw_absence use the following code:
<a href="https://[config.publicHostname]/
According to the documentation config.publicHostname: