Thanks sinip, I did add the define(‘FORCE_SSL_ADMIN’, true); to the wp-config.php but that doesn’t seem to help.
I’ve added the following lines to the .htaccess file, can you see any problems with that?
RewriteEngine on
<IfModule mod_rewrite.c>
rewriteEngine On
rewriteCond %{SERVER_PORT} 80
rewriteRule ^(.*)$ https://www.aviceda.org/$1 [R,L]
</IfModule>