Problem on lead creation

Hi all,

I have a sudden problem when creating new leads.

Normally, you can enter company and contact information, which later on can be converted to an account.

This was the behavior on test tenant until i noticed a change. It is still working this way on production tenant.

Now, when creating a new lead on test tenant, i have to enter an account (with search help) mandatory.

I find it very strange.

I could not find any setting which makes the entry of an account mandatory on a lead. I also compared test with production but could not find any difference...

Does anyone know how this is behaving this way?

Regards