The MIP and DLP 15.8 MP1 has been integrated, the labels created in Azure are syncing fine with the enforce server. However, when they create a label with permission option "Let users assign permissions when they apply the label" it does not sync with enforce even after 4 hours. Labels created with the permission option "Assign permission now" work well.
By default the MIP SDK assumes file labels and filters out other labels. Since the particular label in question is specific to email messages, this label is not getting returned.
The root cause of the issue has been identified and a fix is targeted in the next major release.