Uart Serial

I just flashed to the RatOS beta and I cant connect my SKR MINI E3 V3.0 to my raspberry pi over Uart Serial anymore.

I used to have the following code in the printer.cfg but this doesn't work anymore as it gives an Error configuring printer:
[mcu]
serial: /dev/ttyAMA0
restart_method: command

I tried looking for a solution but couldn't find one. If this doesn't work in the beta I will just buy a otg cable
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