To activate O2O for a Manufacturer entry in OASIS, open the entry from the Manufacturer application in OASIS. Then check "E-Mail O2O". (NOTE: This does not activate a specialization for direct data exchange with the manufacturer. For some manufacturers, having both the specialization and E-Mail O2O should be active. Contact OASIS support if you have any questions.)
At this time, consider checking and adjusting the contacts in the "Contacts" tab.