archive.org – How can I archive a public post from a facebook page?

I would like to archive a Facebook post in a way which can be used as a proof later on in case it gets deleted. I tried wayback machine but it does not work, it redirects to Facebook login which doesn’t doesn’t make sense since the post in public and I can view it in incognito mode. Archive today also does not work, it hangs up after crawling what it looks like a lot of deep links.

Is there a service (free or paid) which I can for this purpose?