I also Have TendaAC 10, not of ACT, but I am looking for a custom firmware. It doesn't even support IPv6. There AC10v3 supports it, but this doesn't, although all of its hardware does.
That AES is a security bug, I did resolve it 2 years ago, but now I don't remember exactly
you need to enable it by editing the config file in notepad manually, and checking the syntax pattern.
something like wpa_crypto=aes , you need to do. just search wherever its using tkip for that purpose