Refused to display 'example.com/' in a frame because it set 'X-Frame-Options' to 'sameorigin'

Support & Bugs
1

I have upgraded my matomo php to 8.1. I have using embed widgets for some time now and after and the upgrade I have noticed I’m getting sameorigin error, refused to connect. none of my settings have changed

2

Maybe the upgrade of PHP updated silently some configuration…
Did you have a look at (especially the last answer):

:question:

3 
Header set X-Frame-Options: "ALLOW-FROM

is no longer an option

4

I was able to find where the SAMORIGIN was set.

5

Where was it hidden?