Why do I get "N/A" in "Chr" and "Position" in SNP annotation?

Some old rsIDs were merged in the recent build, therefore, these SNPs will not have a chromosome number or position. Users can click the hyperlink provided in the results table to see the details in the dbSNP database.

For instance, rs116552240 was merged into rs8176645 in build 138. https://www.ncbi.nlm.nih.gov/snp/rs116552240