Turns out that 23andme tests for this but does not report it. One needs to use these links:
The first link correlates to the C677T mutation with an A result in the DNA resulting in the T mutation in the protein. The second link correlates to the A1298C mutation with a G result in the DNA resulting in the C mutation in the protein. So if 23andme reports AA on the first link, then you are homozygous for the C677T mutation and should research what that means for you even though it is not described with the 23andme results!