here is what i had done
- installed main site
- made second site(working correctly)
- made third site(worked at first & deleted, don't know why)
- made third site again after few days with same name but lost access to dashboard, also site is not opening
- maybe because i had made a subdomain with same name, guess it's directory is opening there as it's not wp install on frontend
- but i had deleted both subsite and subdomain again made subsite with same name , still can't access.