"F5 Rules for AWS WAF Web exploits" blocks client request with large body

As detailed in

K21015971: Overview of F5 RuleGroups for AWS WAF

the primary avenue of support for F5 RuleGroups for AWS WAF is AWS Support

F5 Rules for AWS WAF - Bot Protection Rules

Please contact AWS Support (https://aws.amazon.com/contact-us) for AWS WAF related assistance

AWS do have a channel for accessing F5 Support, and access into the violation information.

Otherwise, you need to post an example blocked request (at least the headers) that may provide some clues as to the sort of violation that is being triggered.