Wordpress admin panel blocked

May I ask what error do you get when you try to access WP-admin?
Only the 522, but for the admin, or generally for the whole Webste?

Kindly, do a re-check regarding the SSL settings and cookies at your origin host/server.

  1. Do you have an valid SSL certificate propperly installed at your server which covers your naked domain and any other sub-domain(s)? → Was the Website working over HTTPS before moving to Cloudflare?
  2. Is Cloudflare allowed to connect to your server? → https://support.cloudflare.com/hc/en-us/articles/201897700-Allowing-Cloudflare-IP-addresses
  3. For the SSL, may I ask what kind of SSL option have you got selected under SSL/TLS tab on Cloudflare dashboard for your domain? (Flexible, Full, Full Strict) → Deprecated - Step 2: Setting up SSL with Cloudflare

May I ask have you contacted the support of your hosting provider? What did they, if so, told you about any outages or some incidents?

May I suggest looking into below articles:

https://support.cloudflare.com/hc/en-us/articles/115003011431-Troubleshooting-Cloudflare-5XX-errors#522error

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