Hi,
I’ve been trying for several days to load my font onto my new site which is being designed on a slightly different domain to the one it will become, but I own & control both. I’ve tried deactivating the security plugins, using a different API (both paid & free), but now the wordpress dashboard declares that my IP address has been blacklisted, and has for the past couple of days. I’ve spoken to everyone who has any technical knowledge about my website, including the hosting company (who confirm they have not blacklisted the site) and all conclude the fault is something to do with this plug in, and can offer no solutions. I hope you can! I have tried submitting a support request via the other methods you recommend on your website, but have had no reply.