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I am sorry to hear you are seeing an error 1020.
May I ask if this error you got when visiting your own website or someone else’s?

May I ask you to post a screenshot of this Firewall Rule? (kindly mask/hide your IP) when sharing)

May I ask what is the position and where is that Firewall Rule located?

Is this the 1st rule from above on the Firewall Rule list in your Cloudflare dashboard → Firewall → Firewall Rules?

Does it mean even if you disable the rule which allows only your IP, it does not work and you still cannot access the site (you see the 1020 access deniad page)?
May I ask how much time did you waited after you disabled this Firewall Rule? (usually needs few minutes to apply the changes)

If so, kindly navigate to Audit Log and check what has changed for this particular Firewall Rule.

Maybe you changed if IP does not equal o equal or the action from block to allow or vice-versa.

Maybe related to the recent issue here if the Firewall Rules does not apply:

Regarding Cloudflare 1020 error, may I suggest you to try looking into below articles to troubleshoot the issue:

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