@uptospeed yes support helped us through the issue. We had to get our hosting provider to whitelist the following IP addresses below:
52.64.125.233
54.153.153.81
More information can be found here:
https://www.polipay.co.nz/support/poli-nudge-delivery/
We are also having the same issue.
FIXED – Our Hummingbird plugin was using minification and I had to exclude rcfwc.js.
