Hi Ray, this setting is not possible. Provisioning two lines in one device are not allowed.

Hi @Ray Bobbitt it looks like you are not the first person to post this question on this forum.

See this post from someone who has successfully provisioned both lines on this device model: Using two extensions with ATA Cisco SPA122 - RingCentral Community Forums

Here are the manual instructions: Manual provisioning for Cisco Cisco SPA-122 ATA | RingCentral MVP

If you need additional assistance, you can reach out to RC Support and open a new case: https://support.ringcentral.com/new-case.html