Sometimes unauthorised WOPI-Host

Hi,

I have the exact same issue. I am getting the Unauthorized WOPI Host every time I create the document and open the document it starts to load the Collabora online interface and then it shows this pop up.

I did find this information, none of which has worked for me yet

Any assistance would be great, Iā€™m sure we are not the only folk with this issues having followed the setup steps.

Thanks in advance.