Go in phone's settings => "Apps" => "Dual apps" => Click the settings icon in the top right corner -> "Delete dual apps' accounts"
Your device will automatically reboot and you can try to create dual apps now.
I have another problem on Mi10TPro with EU Stable Rom 126.96.36.199 that Application GMAIL isn't play notification sounds since I have just set up about notification already.
PS. I have many accounts but setting for all accounts.