The reason is jonam resp. you not responding to Co-Rion's request for further information whether you are using two accounts. Both accounts had their voting privilege revoked.

Is it strictly no two accounts for a single user?
I think it is not
see Site Rules Governing User Accounts
He would have thought why can't I have; rather than why should I have?.
Is there any chance of giving the privilege back to at-least one account?
for jonam and manoj_speed , just apologize to gods if you have voted for one account from another account, and stick to one account for voting

Neither account reacted to my inquiry whether they are the same person. They share details which make it quite clear that they are the same person.

1. A person may have only one account which they use for voting.

This was violated.

I welcome you speaking out for them but as they had enough time to react and didn't, I don't think an apology will be forthcoming.