Envato Element integration into Phlox theme issue

I’m facing an issue when I want to integrate Envato element into the Phlox theme in the WordPress website in order to remove the watermark of demo content images which Envato element linking is required,
when I put my email of Envato element I got this error message:
" No route was found matching the URL and request method. "
how can I fix this issue? thank you