Tira here to help.
It's tough to tell what's going on here but typically when an error message like this appears, there could be multiple addresses on a store.
I'd love to dig into this further with you to find out what's happening.
Here are some questions to troubleshoot:
What is the name of the app that you're trying to download?
Where are you trying to add your address?
Do you have a screenshot of the error?
Once I hear from you, I'll be able to assist!