'CORS Access-Control-Allow-Origin error only in Safari

I've seen a couple similar issues but I can't find any meaningful response.

axios({
    method: 'post',
    url: 'https://(URL).com/ajax-plan-array',
    config: {
        headers: {
            'Access-Control-Allow-Origin': '*',
        }
    }
}).then(response => {

This extremely simple AJAX request is consistently blocked by Safari, but works fine in Chrome/Firefox etc etc. It keeps saying https://(OTHERURL).com is not allowed by Access-Control-Allow-Origin.

I've checked the headers provided by the server again and again and they're completely fine:

access-control-allow-credentials: true
access-control-allow-headers: *
access-control-allow-methods: GET, PUT, POST, DELETE, HEAD, OPTIONS, PATCH, PROPFIND, PROPPATCH, MKCOL, COPY, MOVE, LOCK
access-control-allow-origin: *
access-control-allow-origin-list: *

Again, no other browser blocks this, just Safari. I am not sure how to debug this, as it gives no other information. What am I missing here?

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'CORS Access-Control-Allow-Origin error only in Safari

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