Howdy!
This is currently a known issue that occurs when switching accounts or regions on iOS devices. Our team is already hard at work getting this resolved in a near-future update! I’m sorry for any confusion or trouble this may have caused you Lankybrit. You appear to have already found the workaround when you switch, it will crash, then when you launch the game it will load in the new region. We look forward to getting this resolved as soon as possible!