Hey there, Vishwanathan S
If this is the Microsoft Family Safety app available through the Microsoft store app, here: https://apps.microsoft.com/detail/9PDJDJS743XF?hl=en-gb&gl=GB&ocid=pdpshare, then please can you tell me if you have the latest version of Windows installed on your PC?
I always found the apps available on the Apple and Google app stores better then the Windows store version. Instead, on a Windows device, it is often easier to visit the website here: https://family.microsoft.com
Have you tried downloading the Microsoft Family app on your phone?
If not, please try and download it and sign into your Microsoft account, does it work as expected?
Hope this helps,
Nathan