Why are redirect links not opening via mobile?

Question

HTML

Good afternoon, the site is on WordPress, there are links to whatsapp all around through a redirect of this kind -
https://***.ru/goto/https://api.whatsapp.com/send?...
And I thought that everything works, but it turned out that when I click on my mobile, I get an error:

Страница не открывается
Проверьте подключение к интернету и обновите страницу. Код ошибки 404В

There are no problems with the Internet, external links from the site just do not work.
Now I noticed that the external link to the Yandex map also gives such an error.
There are no problems with PC.
Please tell me what the problem is and how to solve it (then advertising is spinning in Ya.Direct, etc.)

Sample page - urlcut.ru/300d03c14221ba4cd921bcdae8ebb500

Clarification! Redirects work from mobile Chrome, but not from Yandex.Browser

Answer 1

It could be the browser as well. Because such a structure is not quite correct and can be interpreted differently.
It would be more reliable something like this:

https://***.ru/?goto=https%3A%2F%2Fapi.whatsapp.com%2Fsend%3Fphone%3D79001222315

Or at least so

https://***.ru/goto/https%3A%2F%2Fapi.whatsapp.com%2Fsend%3Fphone%3D79001222315