No notifications from one contact

have just one contact that seems to be muted, I don’t received any sounds or notifications when I receive a message from them. My IOS is up to date and I have this years iPad. Hide Alerts is turned off on their conversation. They have a sound allocated to them under contacts (and I have changed to a different sound with no effect). They are not blocked. Do not Disturb is not on. I have restarted messages and restarted the iPad. Bluetooth is turned off. I receive notifications from other contacts. Any thoughts on how I restore notifications and sounds for this one contact for when I receive a message from them? Thanks