Home Assistant - certificate invalid after upgrade - just for iPadOS

Hello.
Have tried to get my head around an issue with the Home Assistant Companion for Apple for some time now.
Running a Home Assistant server (Core 2025.7.1 Supervisor 2025.06.2 Operating System 15.2) on Oracle Virtual Box.
As addon the server runs DuckDNS-service with Let’s Encrypt support
Have several clients running the Home Assistant Companion for Android, but also in Windows.
Also have three clients (iPad) running Home Assistant Companion for Apple. The issue always and only occurs with the iPads.
After the latest update (Core 2025.7.0), once again the three iPads says:
“The certificate for this server is invalid.
You might be connecting to a server that is pretending to be “192.168.x.x” which could put your confidential information at risk”

The solution is easy, just remove the old server in the client-settings and manually add the server again (with the internal and external URL settings as before) and everything works again.

This time, however, I chose to do this only on one of clients (iPad) and again everything worked.
The other two, I chose to leave, all in order to try to understand the reason this issue arise.
I have tried to follow all different suggestion posted, from restart of server and client, over reconnect of network…all without result.

Maybe someone, with wider experience, can support me in order to troubleshoot this issue in the right way.
I imagine that there should be more that have encountered this issue.

Many thanks in advance

Anyone have any advice or thoughts?

So a few things to try:

1 - Update to 2025.7.2
2 - Open companion App settings (if you don’t find a way, pull to refresh and wait 5 seconds until you see an empty state)
3 - If you still can’t open companion App settings you can Swipe up with 3 fingers.
4 - Then go to “Debugging > Reset frontend cache”
5 - Force close the app and open it again
6 - If nothing made it work, open companion App settings again and remove the server you already have
7 - Reboot your phone
8 - Add the server back in

Hello
Some feedback
1 - could not find version 2025.7.2 for the Home Assistant App för iOS, it says that the latest version is 2025.7.1 (2025.1342) = the one that is running
(The server runs 16.0 (2025.7.2)
2-5 does not work
6 - it can find the server, but the result when connect -"No auth providers returned. Unable to finish login. homeassistant://auth-callback
Solution “add server” with the old settings
Remove the old one.
Connected, but just through the local LAN, using 192.168.x.x.

Anybody any suggestions…?