WAF: Exception on Managed Ruleset not working

Hello!

I have one page on my website which contains a JS-Script to load content from Microsoft. When I try to edit and save this page, I receive an error 403 within the Elementor Pagebuilder. Reason is, that this is blocked from the WAF Managed Ruleset within Cloudflare. When I disable the WAF, everything works fine. See picture of the event logged in the security dashboard:

I have setup an exception rule to skip the executing of that rule - nevertheless, it is still executed and reported as blocked in the Security dashboard. Can’t find the reason, why this is not working - anyone who can help here? Settings of the Exception Rule below:

Thanks in advance

Peter