fyi for other users, this was due to an ip block on the Matomo side. Please reach out to Matomo support if you encounter the same issue. https://forum.matomo.org/t/connect-matomo-wp-matomo-wp-piwik-unable-to-link-to-matomo-instance-token-passed-with-get-instead-of-post/64589/3
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This reply was modified 2 months, 2 weeks ago by goochj03.