Fully setting up battery for Intelligent Octopus Flux

I am unable to complete the sign up for Intelligent Octopus Flux as the Octopus app cannot connect to the battery. It asks to check that the battery is fully set up. I am relatively new to home solar and I am unsure of what I should be looking for.
My inverter is the HY 5.0.
Any help would be gratefully appreciated.

Need a lot more info to be able to help.

Perhaps search the forum for intelligent flux and see if anything useful has already been posted elsewhere. It might give you some ideas on what to tell us to help you diagnose the problem.