Resolved, the issue was caused by the wrong IP address being seen by WordPress (or any PHP code) while running behind a CDN.
This caused the nonce’s being created in version 2 of the Ultimate Member to fail due to seeing different IP addresses of the CDN POP’s.
In our case we’ve resoved this using configuratyion change in our web server to consume the client IP address passed by the CDN, making sure all PHP should now see the correct client IP addresses going forward.
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This reply was modified 6 years, 10 months ago by adrianp15.
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This reply was modified 6 years, 10 months ago by adrianp15.
