MohdAmin Hello,
Authorize is meant to be for flashing purpose. Not for removing account.
There are legit way to remove micloud and frp for redmi 6A, by erasing frp and persist partition.
So, after do identify device, instead using special task for clear micloud, you do it manually by select this two partition, and do erase.
Just follow this guide how to do that.
GudLuck