SPF Record fail

Hello Community, 

I'm plaining to change my DMARC record from none to Quarantine, when I checked my aggregate report I saw SPF failures from Microsoft IP address, I already checked my record and I can see the IP address. 

The IP in my record is 52.100.0.0/14

the IP address that failing the SPF is 52.100.14.216,52.100.175.203,52.100.9.237,52.100.19.9.

any idea why the SPF failing with these IP address?

Regards,