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UART2 was configured with the wrong SERCOM for the used pins (PB22 and PB23). However, after changing the SERCOM from 3 to 5 that led to a conflict with UART1 (used for the on-board WiFi). But the used pins are also usable from SERCOM 3, so in the end I switched SERCOM5 and SERCOM3 around. With this change, I was able to get examples/echo working.