CORS policy blocked when using multiple domains

After configuring Snowplow collector to allow tracking multiple domains using network_userid as a first-party cookie (following Snowplow R116) i get a 503 (Service Unavailable) due to:

XMLHttpRequest has been blocked by CORS policy: No ‘Access-Control-Allow-Origin’ header is present on the requested resource.

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R116 is reasonably old (almost 5 years ago) and is a pre-1.x release. Can you try this with a more updated version of the collector?