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I am attempting to use substitute elements in a quotient ring into a formula and then multiply the results together, but I keep getting error messages. Here is my code:

R.<x> = QQ[x]

I = R.ideal(cyclotomic_polynomial(27)(x))

R27. = R.quotient(I)

I am attempting to use substitute elements in a quotient ring into a formula and then multiply the results together, but I keep getting error messages. Here is my code:

R.<x> = QQ[x]
QQ[x]
  
I = R.ideal(cyclotomic_polynomial(27)(x))R.ideal(cyclotomic_polynomial(27)(x))
 R27.<a> = R.quotient(I)
 
R27. = R.quotient(I)
 
f(y) = (1-y)-(1-y)^2/2+(1-y)^3/3(1-y)-(1-y)^2/2+(1-y)^3/3
  
f(a)f(a^2)f(a^4)*f(a^5)f(a)*f(a^2)*f(a^4)*f(a^5)

no canonical coercion from Univariate Quotient Polynomial Ring in a over Rational Field with modulus x^18 + x^9 + 1 to Callable function ring with argument y."
y.