Our Public IP address is BlackListed

We have meeting and Exhibit space that people host consumer show. We provide internet access as part of the service to our Exhibitors. We are finding that several merchants who’s use a mobile payment systems (such as square), cannot connect to the payment app when they are on our network. Many of these mobile payment systems are using Cloudflare dns. Often time we are finding is that our public IP address is blocklisted so Cloudflare dns will not allow the traffic. How can we reregister with cloud fair so that our IP addresses are not blocked?

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