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HTML & W3C Validation errors – Unable to fetch the errors from Markup Validation Service

I’ve been assigned the task of fixing the HTML and W3C validation errors. Of course, before I can fix them, I need to verify the errors first.

So I navigate to the URL:
https://validator.w3.org/#validate_by_uri+with_options

However, when I tried checking for errors, pasted website url and try checking, the validation failed with a 403 Forbidden error.

Here is the screenshot for your reference

enter image description here

Has anyone else encountered this issue? Could it be related to a server restriction blocking the validation process? If so, why would that happen, considering the store is not restricted?

Any suggestions or fixes would be greatly appreciated.

Magento version is 2.4.6-p8