i use the DCF77 library on an Arduino Nano and it works great. When I try to use it on an Seeeduino XIAO, I get no time update.
With the example sketch “DCFSignal” I can see the correct incomming signal. If I use the sketch “InternalClockSync” the time is never been updated.
DCF77 library: https://github.com/thijse/Arduino-DCF77