I finally fixed this. Google had flagged my Matomo server as a phishing site even though Matomo is the only thing that runs on the site and the site is clean. The result of them flagging the Matomo server is that ALL my sites that are connected to Matomo would come up with the red screen. I requested that Google unflag my Matomo server. While I waited I had to deactivate wp-matomo on all my sites. A couple of days later Google said that they had approved my Matomo server. I then had to go back into all my sites and activated wp-matomo and the plugin connected without a problem. A lot of extra work!
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