error page 403 after saving the settings

Hi, i have an issue with installing the plugin. managed to activate it and now trying to insert the js snipped from pipedrive. i can see there is a difference on instructions and what I see in Pipedrive: Pipedrive Settings > LeadBooster. Then, go to the Playbook of your choice and you will find the WordPress snippet under Embed.

In my pipedrive I don’t see embed as an option but I do have an WordPress option and it has js snipped. however using this and saving the settings results error page 403.

is there a mismatch on pipedrive and WordPress versions or something else?