Hello...
I don't know if this a issue related with theme, plugin or osclass core
I have the folowing:
Backoffice Manager: 1.3.0
Osclass Core: 8.0.1
Delta Theme: 1.2.0
When a user create the account if don't choose City or Region the account is created, i have in Backoffice manager to make tis fields as mandatory, so, this should not happen.
Please see attached images...