As per previous report. I had deleted both contacts on the Phone 6, and then used Contact Cards sent by iMessage from My iPhone SE, to Re-install them after re-booting the IP6. In checking settings, it appeared All correct including the Hide Alerts being Off.
However, Still no alerts on both contacts..
Today it was decided to simply delete My full new entry and re-boot, Then make a New Basic entry from an Unidentified Text Mobile Phone No.
This then identified the iMessage and showed a Blue marked "Hide Alert" Circle.
When the New Contact entry details were checked,. It was found that the "Hide Alert" toggle was Switched On.!! (Not having been set manually.) Turning it Off restored Alert for a subsequent message.
Simultaneously, without any change having been made previously. The same "Hide Alert" "ON" setting was found in the Second effected contacts details.. And was duly switched Off. restoring Alert to that Users messages.
Our earlier attempt to use an iPhone 5 to check Message Alerts on the ID Account, couldn't be activated without a Simm card on the relevant Phone No. Even though the users 3 Email address were listed in Messages settings
Unknown Question Remains: What Actually caused these Contacts to show a "Hide Alert-OFF" setting. When both were actually in the "Hide Alert-ON" condition. ???