Look at the smaller code under it. Not you.
530 is a wrapper. The number underneath (1016, 1033 and friends) says what actually went wrong. Depends on the smaller code. Most 530s are DNS or tunnel problems that need the owner.
Nothing on your side causes this. VPN, cookies and browser do not matter here.
Read the accompanying 1xxx code; that is the real error.
Cloudflare’s documentation