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Baz DensonBaz Denson 

endpoint address for exposed apex rest webservice

I had a rest webservice working in a sandbox but when I have moved it to production, I get 401 errors.
I have a custom domain (plusgroup) so the production endpoint I am using is

I am on the EU9 instance so should I use

are there any setting in production that would be blocking my webservice call from reaching my webservice?