The reason is very simple: these people are not the one who will issue the visa!

理由很简单：这些人不是给您发签证的人；

youdao

We guarantee that after his/her journey, he/she will come back on schedule. Please kindly consider issue the visa to him/her.

我公司保证其在结束行程后按时回国。请给予签证便利！

youdao

Without proof of a return flight, the Philippines will not issue Aryee with a tourist visa and will not allow him to leave the airport building.

由于在返回菲律宾时没有随身携带任何身份证明，所以菲方也不同意向阿尔耶发放旅游签证，并且不允许其跨出该机场建筑半步。

youdao

The Obama administration could face a political issue when the visa allowing the younger Mr. Bo to remain in the U.S. as a student runs out.

WSJ: Bo's Son Ticketed in Porsche

Visa signed a multi-year deal with the State Bank of India to issue Visa debit products across the SBI franchise.

FORBES: Visa Charges To $86 On Consumer Shopping Spree

With respect to the visa issue, this is a topic that was brought up by your President when he visited the White House.

WHITEHOUSE: President Obama and Prime Minister Tusk Press Conference