Lian Jue did accept Tingwei's omega self after Yueting's birth and gender issues, albeit with reservations as he couldn't fully understand it nor do their world's science can back it up with facts.
But he's acknowledge Tingwei's heats and is trying his best to help. Lian Jue would even try to mark Tingwei as per Tingwei's request during his heat, but because Lian Jue is of another earth, he could only leave temporary mark on Tingwei. And it frustrates him that he can't mark Tingwei and how he can't be the same as Alpha in Tingwei's story even tho Tingwei told him he'd probably be an Alpha if their were on Tingwei's world.
Is the top will never acknowledge that the uke came from another world? Or mistranslation?