Analyze why a website is not working on OPPO and VIVO in built browsers

We have a website that works on all phones/desktops except phones like Oppo/VIVO and their packaged browsers. It works on chrome on the same phones. We do not know why. This project is to analyze why its not working on those phones? what is the error

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หมายเลขโปรเจค: #29867165

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