Mobile safari uri scheme not working intermittently

I am working Web to App flow for my product. Tolink to my app from web service, I define uri scheme from app and use it from my web site.

But, when I try to use this scheme from mobile safari web, It sometimes failed with message that uri is invalid. That is weird It failed SOMETIMES not always Even I tried with same url.

In my device, there is current version app.

Why this happen? How can I resolve this issue?

Mobile safari uri scheme not working intermittently
 
 
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