Automatic territories assignment does not work anymore

Automatic territories assignment does not work anymore

Hi,

The automatic territories assignment based on user's territory was working but not anymore.
Last friday, I wanted to test the CRM for a B2C model and to do it, i uncheck "mark as mandatory"  for a company to a lead and account to a contact. When i decide to get back to a B2B model and check "mark as mandatory"  for a company to a lead and account to a contact, it seems that the automatic Territory assignment based on user's territory does not work anymore.
I know i have the possibility to set up a rule of assignment but i prefer the automatic assignment.
Could you please help me with this ?