Sandbox account cannot make outbound call due to "invalid" emergency address

I am no longer able to make outbound calls with my sandbox account. It shows this yellow checkmark saying "Outbound calls restricted" when you hover over it.

The problem seems to be that it needs an emergency address; however, no matter what address I put in it just says:

With no indication of which field is in error or what the problem with the address is. Any advice on how to resolve this? It would help my workflow to be able to test with outbound calls again.

Thanks,

Dan