Yes, it can print duplex. Try installing new drivers.

Yes, the Epson EcoTank ET-2815 comes with the coloured ink bottles. These bottles contain enough ink for up to 3 years of printing, specifically: - 3,600 pages in black and white - 6,500 pages in colour.

The instructions are in several languages, including Italian. The installation was well described and worked. However, my black ink nozzle was defective after a short time. Returning it to the supplier is also easy. However, I then had to wait almost 3 months and keep asking until I got my printer back. It has been running smoothly ever since.

Yes, usually a starter set that is sufficient for a certain number of pages.

Unfortunately, we cannot identify the cause in such general terms. It might be worth trying to install the latest device drivers manually: https://www.epson.de/de_DE/support/sc/epson-ecotank-et-2815/s/s2110#drivers. I also found the following discussion online, where a similar problem was described: https://answers.microsoft.com/de-de/windows/forum/all/unter-windows-11-ist-seit-14151221-kein-farbiges/b82a82c5-de40-48e1-ae9e-562f318ed20f.

According to our information, 4 x 65 ml single ink tanks (black, cyan, yellow, magenta) are included in the delivery.

I bought this printer precisely because of the "duplex capability" stated on Galaxus. After installation, I looked for duplex printing, in vain. I now turn the page manually when necessary!

I "only" found a USB port on the unit. However, the unit is W-Lan capable. It should therefore be possible to connect it to the LAN via this option. I did not try this, however, because USB is OK for me.