Under Sync Preferences, I see "Nightly on Nexus 6P". On Manage Devices page, I see "Firefox Mobile 56. Android 7.1" marked as the current device. On desktop, I don't see neither of the labels in any device list - not in Synced Tabs, not as a target for sending a tab.
Component: Firefox Accounts → Android Sync
Product: Firefox for Android → Android Background Services
Changing the device name changes the problem. I renamed device to "(real)Nightly on Nexus 6P", and I can now see it under Synced Tabs and in a Send Tab list. However, in Manage Accounts that device is still listed as "Firefox Mobile 56. Android 7.1". It seems that we're not keeping our FxA device record up-to-date.
Checking the device list ~5 minutes later, the names now match!
This doesn't seem actionable at this point; we're also a bit more robust now with syncing device lists.
Status: NEW → RESOLVED
Last Resolved: a year ago
Component: Android Sync → Firefox Accounts
Product: Android Background Services → Firefox for Android
Resolution: --- → INVALID
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