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From the Epson Help page:

Wipe the green Intellidge Chip on the cartridge that is not recognised.

While we generally recommend not touching the green Intellidge Chip on the cartridge, wiping it with a dry, lint-free cloth or dry paper kitchen roll may resolve the issue:
Take out the unrecognised ink cartridge.
Wipe the chip with a dry, lint-free cloth or dry paper kitchen roll.
Repeat this for any ink cartridge that was indicated as not recognised.


Check the chip contacts within the ink cartridge holder for any debris or dried ink and wipe with a lint-free cloth if necessary.