When trying to download the tablo app on my sony XBR-43X800D tv from the google play app, it stays in a “pending” status and does not download.
That is pretty old TV (2016). It is possible that Sony hasn’t been updating them to a version of Android TV that is compatible with the Tablo.
Your best bet is to submit a ticket via this link: https://support.tablotv.com/hc/en-us/requests/new