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ADIN2111 no Link with Overlay and ADI-Kuiper

Good day,

I am using ADI-Kuiper with the rpi-adin2111 overlay to connect an ADIN2111 Single Pair Ethernet Evaluation Board. The interface seems to be connected correctly.
However, I have a problem with the link status.
When i use dmesg | grep adin to output the kernel messages, I see that the link becomes active for a short time, but is immediately switched off again.
I used this tutorial

adin1110 spi0.0 adin2111-0-p0: Link is Down
IPv6: ADDRCONF(NETDEV_CHANGE): adin2111-0-p0: link becomes ready
adin1110 spi0.0 adin2111-0-p0: Link is Down

Does anyone have an idea or solution for the problem?