W3C link checker: Status: 501 Protocol scheme 'tel' is not supported

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I'm trying to validate the links via https://validator.w3.org/checklink, but getting error

Status: 501 Protocol scheme 'tel' is not supported

I tried to search on google and went through with many articles I don't find satisfying answers.

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This means that the validator has not been programmed to test tel: URLs in its process of checking links on a page. The testing would mean actually making a telephone call; and this is what you can do to test a link with a tel: URL: open the page in a browser that supports such links and activate the link.