Nextcloud with office online server issue

i have do integrate office online server with next cloud
and its reachable
but the files cant open , and i see this error

We couldn’t find the file you wanted. It’s possible the file was renamed, moved or deleted.

so how can i solve it its urgent issue
i try follow this but its not help !!!

Hi there,

I’ve read somewhere else that you have to use HTTPS for the server in the app config (if you don’t have it already configured).

In addition you must enable TLS 1.2 on the Office Online Server e.g. by executing the following in a PowerShell:

Set-ItemProperty -Path 'HKLM:\SOFTWARE\Microsoft\.NetFramework\v4.0.30319' -
Name 'SchUseStrongCrypto' -Value '1' -Type DWord

The server has to be rebooted afterwards. More information here.