Error on merging products under variation(Amazon India)

So, I am working on a brand and I need to merge some listings in variation for bracelet category. I tried everything including bulk upload, the listings are converted into variation but the child asins take the title of the parent. Neither seller support could fix it nor Account Manager. Have any of you faced this issue? Or do you have any ideas how to solve this issue? Also doing the same for other brands dosen’t have any issue.