Direct link render image doesnt show image

I have grafana running as container with render container and the rest. all is working fine, I have webhook setup to be sent on an alert, I receive all parameters great imageUrl, message etc. Problem I have is that imageUrl doesnt show an image, just a white dot in middle of the screen. Logs dont show any errors when I go 'Share - And press ‘Direct Link render image’, logs show as

t=2021-01-28T17:16:23+0000 lvl=info msg=Rendering logger=rendering renderer=http path=“d-solo/B_RF47YMk/docker-containers?from=1611853500000&to=1611853500000&orgId=1&panelId=8&width=1000&height=500&tz=Europe%2FDublin”

But there is no image.