iOS In-App Purchase tester dialog missing Apple ID entry field

My Sandbox dialog used to come up with an Apple ID field but after I have entered the credentials wrong several times im now suck with a version of this dialog without the Apple ID entry field. I've tried General>"Remove all data", deleting and recompiling app to device and signing into different Gooogle accounts but nothing helps

Anyone know how to get this version of the dialog back so I can try new tester accounts?