PrintPreviewHandler makes access token requests for the primary account. It also does so using DeviceO2TS. Doing this conversion will involve having figured out our story for the Identity Service and device identity.

Note that technically speaking, we could just convert the codepaths that talk to PO2TS to talk to the Identity Service. That would make the code locally a bit more cumbersome though, so it would be best to just do this work once having figured out the blocking bug.