Can activate windows 10 pro using 8.1 pro retail online key?

Có, tôi đã thử dùng key w7 all volume get web để kích cho w 10 pro vẫn thành công

If the key become byphone key, can we using it to activate by get confirmation ID?

if key is online

I have win 10 pro phone key for you, activate with this: Key: C2QV9-NJJWR-FKCY3-MHXYP-W2QGT Description: Win 10 RTM Professional Retail Sub Type: [TH]res-v3308 Error Code: 0xC004C008 Time: 21.39.32 09.05.2021 (GMT+7)

It is possible if the key is online