Problem Granting Permission to Usernames containing / or . ???

Can someone explain why I am unable to do this now on my SQL Database.
Suspect it is some settings / collation or the like but when I say

GRANT EXECUTE ON functionname TO DOMAIN\Fred.bloggs

I get Incorrect syntax near \

I have tried dynamic sql and performing replace strings using CHAR() etc.

I am sure I used to be able to do this kind of thing without syntax errors?

Has anything changed in SQL??? Or am I missing something?

HELP! Please

--
Steve G
.

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