Google Photos miner uses deprecated Picasa API
I couldn't find out if this has already been adressed in 3.32, but on 3.30 I get this message in the system journal:
Mai 06 19:40:18 ocelot org.gnome.OnlineMiners.GData[1864]: Error while refreshing account account_XXXXXXXXXX_0: Invalid request URI or header, or unsupported nonstandard parameter: The Picasa API is deprecated. See https://developers.google.com/picasa-web/ for more details and the migration guide.