I don’t think BPS Pro is blocking EMCP, but to eliminate BPS Pro do the troubleshooting steps below. If the troubleshooting steps below work then let me know that. If the troubleshooting steps make no difference then most likely something is not configured correctly or something else the site has installed is causing the problem. Delete all cache: Browser, Plugin cache and Cloudflare cache and test again.
1. On the Security Modes page, click the Root Folder BulletProof Mode Deactivate button.
2. On the Security Modes page, click the wp-admin Folder BulletProof Mode Deactivate button.works.
3. On the Security Modes page, click the Plugin Firewall BulletProof Mode Deactivate button.
The EMCP tools link you posted is referring to Kinsta’s Bot Protection and/or Kinsta’s Vulnerability protection plugin. Are you using either of these?