Hi mailburner,
Thanks for choosing Electric Ireland.
In this scenario, the meter from the other provider needs to be topped up until when (or shortly after) the new company starts providing the supply.
The deactivation code will not be available to the PAYG meter provider until the above commences. It seems like that has not commenced yet. It may be a bit soon, as it is only one working day since you switched. It can take longer than this.
We recommend checking with the other provider again tomorow, to see whether they have received the deactivation code which will automatically become available to them once Electric Ireland send them the message that they are providing the supply.
The meter will have to be topped up until the deactivation code is inputted - even if Electric Ireland has already started supplying the property. So if you end up topping up by more than you need, you can request a refund from the PAYG provider.
Let us know if you have further queries.
Kind regards,
Una