Issues with rel="canonical"

OK guys, I did not know this was such a big issue until today.

Appearently SP add's a rel="canonical" to every SP website that uses a custom domain (= most of them). But as we all know Google only accepts rel="canonical" tags when there is maximum 1 in the code. Because SP is adding its own code that means we can not add our own rel="canonical" tag to avoid duplicate content.

In a current project I have this problem, because we have duplicate content and the canonical website is of course a SP website.

I hope there is someone with a solution on how to bypass or override the default rel="canonical" tag in SP.

Hi,
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Does anyone have an answer to this, please?

I've researched this and everything says to add a rel="canonical" tag to the header of a page.

In Squarespace this is pointless because SS automatically adds that to every page, and if there are 2 such tags on a page, Google ignores them. So apparently I cannot canonicalize a webpage. Is there any way to replace SS's default canonical tag from one webpage on my site?