This is My Domain

1020 indicates a Firewall Rule blocked your access to the website if it’s your site you can go to https://dash.cloudflare.com/?to=/:account/:zone/security/events and find the event log entry showing what happened.

You can then go to https://dash.cloudflare.com/?to=/:account/:zone/security/waf/firewall-rules and reconfigure or disable the Firewall Rule that is blocking you.

You can read more here:

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