SharePoint App giving credentials popup

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Click on Start -> Run and type regedit. Locate the key 3. HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Lsa Right click on this key and choose New > DWord Value Name this one "DisableLoopbackCheck" Double-click then on it and type the value “1” Reboot your server. (Mostly not required) This helped me in resolving the issue. I am using windows server 2012 and on creating new dword it prompts 32 or 64 bit. I created 64 bit but it does not resolve the issue. I deleted that and created 32 bit dword DisableLoopbackCheck and setting its value 1 resolved my problem.