Welcome Dante FRED,
I understand how frustrating it can be when you are trying to connect a Microsoft Wireless Mobile Mouse 1850 to a Chromebook using Bluetooth and cannot find a pairing button.
Before proceeding, could you please confirm:
- Does your mouse have a small USB receiver (dongle) stored inside the battery compartment or plugged into another device?
- Can you confirm that the model is Microsoft Wireless Mobile Mouse 1850 and not Microsoft Bluetooth Mouse?
I look forward to your reply so we can continue working together to address the issue.