You don't have enough required items while claiming lvl40 reward

Do anyone knows why this happen?

•I do have inventory/storage space when talking to Astarte •I don't believe to be reached item cap on any of the rewards •I closed/restarted the game

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If you have the ARKS Badge: White in your inventory, that may be a mistranslation. The first thing I'd check (after confirming the White badge is on you) is if you have two free spaces in your inventory. If you do, it might also want there to be free space in your storage even if you have inventory space (as that blocks some item acquisitions like FUN scratch).

Sorry after several tries and a full pc restart it finally worked somehow...