I think you're missing a quote in your original macro.
You wrote:
 (defmacro foo [& xs] `(map identity ~xs))

Try this in a REPL:

user=> (macroexpand-1 '(foo 1 2))
(clojure.core/map clojure.core/identity (1 2))

That shows you that it's going to try to evaluate the form (1 2). The
original complaint is that 1 is not a function.  Using the vector
notation [] created a literal vector which works without quoting.

Try this instead:

user=> (defmacro foo [& xs] `(map identity (quote ~xs)))
#'user/foo
user=> (foo 1 2)
(1 2)

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