What does the warning icon mean in the blockcert verification page?

Hi, I need help in understanding what does the warning icon mean. When I clicked on view transaction link, blockchain can’t find the transaction. However when I manually entered the transaction id into blockchain, there is indeed a record. What does the warning icon and this means? Thank you.

The warning is attempting to draw attention to the text below: “This is a vlaide Bitcoin Testnet certificate.”

Nothing except a fully valid certificate on a production blockchain will get the green checkmark to help prevent any misunderstanding.

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Thank you very much!