When using our azure student account and with the 100$ in my subscription , i can't create any ressource .

Question

for example here when creating a ressouce group i get :

The client '******@xxx.xxx.tn' with object id 'xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx' has permission to perform action 'Microsoft.Resources/subscriptions/resourceGroups/write' on scope '/subscriptions/xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx/resourceGroups/tp1rg'; however, the access is denied because of the deny assignment with name '[UnusualActivity] Full Deny assignment on 
xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx
 for user 00000000-0000-0000-0000-000000000000 at root added' and Id '
xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx
' at scope '/'.
 (Code: DenyAssignmentAuthorizationFailed)

what to do in this case , i'am stuck .