Symptoms
After upgrade to OSA 7.0-7.0.1 subdomains search form in the online store does not return any results, No domains found is displayed instead, domains search works correctly.
Cause
The issue is caused by the bug with id #PBA-77625 ("Subdomains cannot be purchased").
Resolution
The only workaround until the bug is fixed is to include the plans with the subdomains to the sales category Domains which is published in the store.