Create payment link returns "An unknown error occurred."

I have account which is in sandbox and i am implementing Create payment link (POST /v2/online-checkout/payment-links) API in my software. i have filled the required parameters in api in order to return successful response. and it gives me the success when i call this api and also returing links. Every time i call api it returns success response and returns the link and when open it always shows “Something went wrong, An unknown error occurred.”. i do not know why is this happening

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https://sandbox.square.link/u/5DridTCw

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Checkout API
Postman
Square Order Checkout

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