Lost text message

all previous iMessages for one contact disappeared.

1. checked iMessage set to "forever"
2. turned off iMessage in settings and then back on
3. checked email and phone numbers iMessage sends from and to
4. all other contacts iMessages are intact from "Forever"
5. tried several online actions but nothing seems to get this contacts iMessage history back.

What to do next?

anacrites wrote:

I have received a text message on my iPhone 13 but cannot seem to locate it - where do I look ?

In the message app.