We have 4 Clover dev kits, 3 of them are working fine. But one of them, a Clover Flex (2nd Gen) dev Kit, which is configured as the others are, and is connected to the Internet and has the Cloud Pay Display app opened but it isn't responding to the request I send. Even the Ping Request returned error 504 and ask me to manually open the Cloud Pay Display. What may be the cause of this error?
