Preview error

Hi,

I get the following message when trying to create a new portfolio layout

The requested URL /vp_preview was not found on this server.

The preview will not show and likewise when I try to add the layout to a page the same error appears.

I have tried the following as suggested in one of the previous threads:
-Deactivated all of my plugins.
– Reset my theme back to Twentynineteen
-On WordPress root folder, changed the wp-config.php and set the value of WP-DEBUG to true

None of the above has fixed this issue.

I saw a previous post some time ago from a user who was having a similar issue and they were using web host OVH, could this be the issue? This is also the webhost I am using.

Do you have any other suggestions for fixing the issue?

Thanks