Need a database/server management developer for my iOS mobile app

My mobile app in iOS is currently in testing via testflight, and some of the users can't signup on my app. When they fill in their details and hit signup, the waiting/loading sign keeps circling indicating there may not be any requests/communications from the server. The same users can, however, signup on my test device. I need this investigated and fixed as a one off job.

Beceriler: Veri Tabanı Yönetimi, Veritabanı Geliştirme, Veritabanı Programlama, Serbest Çalışma, Microsoft SQL Server

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Proje NO: #17222976