No "Open in Internet Explorer" available

[Vince200]

Can't seem to get the "open in Internet Explorer" to appear under More Tools. We are running Version 83.0.478.45 (Official build) (64-bit) build with GPO. Internet Explorer Integration is set for IE Mode.  Not sure what is preventing the "open in Internet Explorer" from appearing. Any thoughts?

[#2]

@Vince200 In my believing one should have a sitemode list file available on a filesystem of site if the integration is configured, at least that is what we have in place.

reg, Henno