Hi.

There is a maximum amount of times per week in which you can receive rewards from completing Team Instance. There is 20 rewarded TI attempts each week plus an extra 5 to be completed with those above lvl 5 friendship. After these have been completed you will no longer be rewarded for any TI attempts.

You can check how many reward attempts you have left by checking the Rewarding Attempts which is located right below the Conditions in the Daily Practice Interface, in your screenshot it shows 0/0 remaining.

Hope this helps you to understand better =)