Cant add family members to Apple home

Unfortunately I can’t translate what the message says in the screenshot but it might be their iPhone isn’t running the latest software to accept Home invites and use it from this device. It needs to be running at least iOS 16.2 -this is if you at some point had Upgraded to the new Home architecture

Any device that is connected to an upgraded home and not running the latest software will lose access to the home until the device is updated. This includes people that you invite to control your home.

• Check that you and people that you invite to control your home have turned on two-factor authentication for Apple ID and iCloud for Passwords and Keychain.

can you tell us in English what the error message says on this screenshot?

Invite someone to control your home

Open the Home app on your iPhone, iPad or Mac. , then select Home Settings. If you have multiple homes set up, choose the Home that you want to invite someone to, then select Home Settings. Tap or click Invite People.

Share control of your home - Apple Support (IN)

Invite others to control accessories · On the Home tab, tap the Add button , then tap Add People. · Tap the Add button · Tap Send Invite. · Ask the invitee to do ...

Invite others to control accessories in your home