I'm trying to find some guidance on dry riser outlets fitted in a protected lobby of hotel with refuge area?

I am not aware of any guidance on that particular situation, however BS 9990 says it should be fitted on an external wall and in most buildings I have had dealing with, they usually located in a reasonable large protected lobby. In my opinion the refuge is irrelevant, as the refuge is for a short term stay and should be cleared before the arrival of the FRS. If the management fail in their duty then the first fire crews will remove ant disable people before the dry riser is used.