You can use this link to find the support number for your area. If you have a service agreement with Xerox that includes supplies you would use the metered cartridge, if you do not have a service agreement or a contract that doesn't include supplies you would use the sold cartridge.
Model is : Xerox WC 7855
Second Q: How do I know if my printer needs metered or can use "Sold" replacement toner?
Is there a step by step way to check?
What is the model of the device?
Why is this not just working? OEM - Took one out - put one in. PIC (top is new one in pic). I hope you can see the pic. I installed a toner - exactly the same OEM, but it says "Not Compatible"