MkrWan 1310 no response on activation

Hi,
Im trying to connect my Arduino MrkWan 1310 to the TTN. I can see activation calls in the TTN console with different gateways but I do not get a connection and therefore no data can be sent. Any Idea how to debug this? Im using the latest version of the mrkwan library: https://github.com/arduino-libraries/MKRWAN/blob/1.0.11/src/MKRWAN.h

Thanks for any hints!
Guido

I found a solution myself to the problem above. I entered a long delay of 10 seconds between modem.begin and modem.joinOTTA and it now connects. I do not know why this is necessary but it works!

Cool! I have the MKR 1300…and I keep getting error message telling me to move next to a window.