Allele count is zero
The AC is the number of alternate alleles from called genotypes, you can see this in the vcf header:

##INFO=&lt;ID=AC,Number=A,Type=Integer,Description="Total number of 
alternate alleles in called genotypes


Assuming diploid, if we have 3 individuals, 0/0 , 0/1, 0/0, AC will be 1, because it detects 1 count of alternate allele.

If you look at your genotype calls, all are 0, so AC = 0