[HotSpot] HTTPS Captive portal issue and Iphone`s need to reregister every time

I replaced the gateway of our current wifi network with a Mikrotik Router and enabled Hotspot features for the Wifi VLAN. This seems to be working fine, but with two issues so far

IPhone needs to reconnect everytime

The iphone users need to relogin everytime the phone reconnects to wifi. Which is strange since the timeout of the trial users is set to 12H. So there seems to be a valid login session

HTTPS Portal is not working properly

I have added a certificate to support the hotspot portal and www-ssl management. The webinterface is working fine (HTTPS Certificate is valid) But when i open the hotspot portal on a wireless device the status page is redirected to http instead of https:// which gives us certificate errors. The html code is redirecting to variables so i gues i need to change something in RouterOS

Some Config

/ip hotspot profile
add dns-name=wlan.domain.com hotspot-address=10.15.0.1 html-directory=domain_hotspot login-by=mac,http-chap,https,trial mac-auth-mode=mac-as-username-and-password name=DomainHotspot ssl-certificate=\
    wildcard-domain-com.cer_0 trial-uptime-limit=12h
    
/ip hotspot
add address-pool=WLAN-POOL-UNAUTH disabled=no idle-timeout=none interface=vlan15 name="Domain WLAN" profile=DomainHotspot
[admin@wlangw] /ip hotspot>