Hi Ismael

Thank you for your answer. Unfortunately it doesn’t help.
I can’t set a SSL certificate for a subdomain. However – you can open and log in to the page by adding a exeption in your browser.
I checked if there is a modified header.php. There is no such file, only functions.php.

Please help by loging in to the dev enviroment and do all needed settings.

Best Regards
Remo