In the submission file (OXTR.vcf.gz), the position (POS) infnormation is missing for all 5 variants. The data can be processed as there is no way for dbSNP to validate it.
  

zmore OXTR.vcf.gz|cut -f1-8
------> OXTR.vcf.gz <------
##fileformat=VCFv4.2
##fileDate=20211211
##source=PLINKv1.90
##contig=<ID=3,length=1>
##INFO=<ID=PR,Number=0,Type=Flag,Description="Provisional reference allele, may not be based on real reference genome">
##FORMAT=<ID=GT,Number=1,Type=String,Description="Genotype">
#CHROM  POS     ID      REF     ALT     QUAL    FILTER  INFO
3       0       rs53576 A       G       .       .       PR
3       0       rs2254298       G       A       .       .       PR
3       0       rs1042778       G       T       .       .       PR
3       0       rs2268494       T       A       .       .       PR
3       0       rs2268490       C       T       .       .       PR