4 in a row expiring

Did you get the reward or did it give you the "Time's up" notification? It's difficult to figure out what you mean.

It gives you the "Time's Up!" notification when you have not completed a square and your teammates complete a row.

So the two other people managed to finish a row before you finished ticking a single square on the board.

You didn't lose anything. You just didn't complete a square, so you don't get a reward for that round. Just start a new round and complete a square to get a new reward when a row is completed.

If you're absolutely positive of that, and it really bugs you, you can contact support. If you're using the app, select the gear, then the ?, then click Events, then 4 in a Row, then scroll to the bottom and click Contact Us.

It could be that you got the reward for the previous one and just don't remember. I often skip through screens when I'm thinking about something else. It happens. Then, you were still thinking you were on that board and didn't complete squares on the new board. But that's just what I would assume happened if it were me.