Cleaves the GlcNAc-Asn bond which joins oligosaccharides to the peptide of asparagine-linked glycoproteins. {ECO:0000269|PubMed:1703489, ECO:0000269|PubMed:1904874, ECO:0000269|PubMed:2401370}. This is the function of Ensembl gene identifier ENSG00000038002 (AGA, aspartylglucosaminidase).