Brands not exporting to third-party feed

Plugin works great within my Woocommerce site, but when I try to export products to other sites, the ‘Brand’ value is not sent at all and brand field appears blank on the other end. This happens with various applications. One of them is Nembol, a website allowing feed export to marketplaces and they weren’t able to help with the problem suggesting it’s the brands plugin issue. Is there something I need to activate for brands to appear in feeds?

Many thanks in advance