I can't seem to find anything that suggests SafeEncryption is not supported by Lucee yet I am receiving errors : No matching function [SAFEENCRYPTION] found. Can anyone confirm if this function is not supported?

What is the code you are trying to run this against? As I believe that may be a custom tag or bit of code you are using.

its a fusebox application. I've had a look but can't see it being defined as a custom tag. might be a fusebox in built function perhaps?

I think it may be a custom bit of code in your Fusebox app. I am not, admittedly, strong in fusebox. You could always fire up a text search program such as Notepadd++ and search your entire code base for that string, or in linux use grep -ri "SAFEENCRYPTION" /path/to/your/code/ > foundin.nfo