Grafana - origin not allowed

Hey all,
I’m trying to get our grafana instance set up behind an apache reverse proxy. I’ve been getting origin not allowed messages when doing any datasource additions or dashboard saving. I have set the ProxyPreserveHost On but still seeing the same issues. I’ve also tried Header set Access-Control-Allow but to no avail. Any suggestions what I might be missing? I’m using Grafana version 7.5.15 (Rocky appstream)
My current config looks like this:

ProxyPass "/grafana" "[http://localhost:52391/grafana](http://localhost:52391/grafana)"
ProxyPassReverse "/grafana" "[http://localhost:52391/grafana](http://localhost:52391/grafana)"
Header set Content-Security-Policy "frame-ancestors 'none';"```