Log in to your Cloudflare account by going to cloudflare.com
Click on the "Firewall" icon
Click "Firewall Rules" and "Create a Firewall rule"
Name your rule "Clariti" and fill in the following details:
Field ⇒ User Agent
Operator ⇒ contains
Value ⇒ Clariti
Then, select an action:
Bypass
Choose a feature:
User Agent Block
,Browser Integrity Check
,Hotlink Protection
,Security Level
,Rate Limiting
^ Select all available features
Click "Deploy"

Clariti should no longer be blocked by Cloudflare firewall rules.
If you are still having trouble onboarding your account to Clariti, please make sure to turn off "Bot Fight Mode" from within CloudFlare. To do that, follow these steps:
Go to Firewall
Select Bots
For Bot Fight Mode, select Off
Please try again onboarding your site to Clariti.