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I am getting this error on recurring payments on one of my WPMU sites where I intentionally allowed my site to pay our account. It's the only one site not on permanent free extension for testing.

In the site's profile I see log lines like these

User creating new subscription via PayPal Express: Initial payment successful (xxx Sites Pro: $27.00 SGD each month) - Transaction ID: 4EF00008G3649962A

I am stumped. Thank you for any help.