The join predicate is not time bounded. JOIN operation between data streams requires specifying max time distances between ...

The join predicate is not time bounded. JOIN operation between data streams requires specifying max time distances between matching events. Please add DATEDIFF to the JOIN condition.
Example:
SELECT input1.a, input2.b FROM input1 JOIN input2 ON DATEDIFF(minute, input1, input2) BETWEEN 0 AND 10