client denied by server configuration

I am not getting any stats in burst. Am trying to go cookieless, so no annoying cookie banners.

My site is averaging over 10 unique visitors per day, according to Siteground’s stats and 1-2 per day according to Google Search Console.

The environment

Hosted by Siteground

WordPress latest version, all plugins up to date

debloat optimisation plugin

website runs on GeneratePress

What I have tried so far:

On checking the hosting provider’s error logs I found events are firing twice – at the same time, but in each line, I see
“…AH01630: client denied by server configuration: …endpoint.php”

I have checked permissions on the endpoint file in my file manager, and all is as should be. (644, as suggested in the documentation page)

Burst Statistics in the WordPress dashboard claims it’s using the REST successfully. It looks like this is being checked as stated in the dashboard, and as set up in the cron job below.

Since I have had a problem with scheduled events, I have disabled WP-cron and have set a cron job up to fire wp-cron twice an hour.

I have excluded the burst javascript files from minification and combination, as suggested on the documentation page too.

The page I need help with: [log in to see the link]