Hi,
Do you mean that you produced an A/B test and when the Test duration you set is reached, even if one version has a 2% higher open rate than the other, the test result is still determined to be inconclusive?
As the official documentation says, “In each case, the winner is the version that produced the most clicks or opens as a proportion of the total number of times that version was sent.”
It doesn't mention a definite value to determine winner, so it should be that as long as a version has a higher click-through rate or open rate, it should be a winner.
If this data discrepancy does exist and affects you significantly, it is recommended that you open a ticket to MS to resolve the issue.
Of course, you can also choose which version to keep manually based on the test result:
Email A/B testing (Dynamics 365 Marketing) | Microsoft Docs
If this helped you, I'd appreciate it if you'd mark this as a Verified Answer, which may in turn help others as well.
Best Regards,
Nya
