Yale assure Lock 2 plus Homekey not working on my family members phone.

My Yale Assure Lock 2 Plus won't open using HomeKey on my family members Iphones.

When the lock was first setup and added to our home we all got homekey's added and everything worked. In trying to sort out an lock issue, the lock was reset to factory settings and in doing so removed from HomeKit.

Once it was re-added, homekey works on my devices (I am the home owner) but not on my family members. While tapping, the key shows a blue tick mark in wallet and the lock appears to recognise it but does not unlock.

We've tried;

• removing and re-adding everyone to the home (homekeys were removed and re-added)
• signing out and back into iCloud (all cards, including homekey, removed and re-added)
• full device reboots
• adding the lock to HomeKit from her device
• Factory reset on lock for several time
• Contacted yale support team and spen over 2 hours in trouble shooting and finally they said it is an apple homekit/ homekey issue

Using iphone 16 and the latest Ios update was two weeks back. I am not sure that this issue is linked with the ios update.

Any one faced such an issue and any way out