SharePoint Online: Set Mutli Value User Profile property with REST API

Set.Mult.UserProfileProperty.js

(function ($) {
    'use strict';

    var requestHeaders = {
        'X-RequestDigest': $("#__REQUESTDIGEST").val(),
        "accept": "application/json; odata=nometadata",
        "content-type": "application/json;odata=nometadata"
    };

    var userData = {
        'accountName': "i:0#.f|membership|[email protected]",
        'propertyName': 'SPS-Skills', //Can also set custom userprofile properties.
        'propertyValues': ["SharePoint", "Office 365", "Architecture", "Azure"]
    };

    $.ajax({
        url: _spPageContextInfo.webAbsoluteUrl + "/_api/SP.UserProfiles.PeopleManager/SetMultiValuedProfileProperty",
        type: "POST",
        headers: requestHeaders,
        data: JSON.stringify(userData),
        success: function (data) {
            console.log(data)
        },
        error: function (jqxr, errorCode, errorThrown) {
            console.log(jqxr.responseText);
        }
    });

})(jQuery);

trying to replicate this functionality via workflows in SharePoint designer, using the call http web service method. Single property works fine, but with this function I get the following error, ever seen it?

When trying to read a null collection parameter value in JSON Light, a node of type 'PrimitiveValue' with the value '["SharePoint", "Office 365", "Architecture", "Azure"]' was read from the JSON reader; however, a primitive 'null' value was expected.

Hi vman, Thank you for your example. I used the same approach in MS Flow and it works great so far but I'm not able to update user profile properties of guest user's in SharePoint Online. I'm gettting the error "403 - Access Denied".
Do you know if perhaps this is a known restrictions or if it should work?