I open a support call with Microsoft and the engineer had me reset the people picker using stsadmstsadm
:
stsadm.exe -o setproperty -pn peoplepicker-searchadforests -pv "" -url "https://sharepoint"
stsadm.exe -o setproperty -pn peoplepicker-searchadforests -pv "" -url "https://sharepoint"
Simple.