AIB said it has resolved an issue which impacted customers using Android devices logging into their mobile app and online banking earlier today.
The bank said all services are working as normal and they apologise for any inconvenience caused.
It said customers with any queries can contact them on 0818 724 724.
An earlier outage had impacted customers using Android phones leaving them unable to use the app or fully access their accounts.
This was due to the bank experiencing issues with mobile and online log ins and push notifications on Android phones.
The bank said the issue is now fully resolved.