Hi Micky
I’ve not tried this app before but now you’ve mentioned it I gave it a go.
When you open the app there are two choices, 1 “sign in” or 2 “create an account”.
When you selected the number 2 option it goes on to 4 other choices and the choice you need to make is “Yes I get cover with my car, bank or insurance”.
After selecting that it will ask for you sir name and postcode and the reg of your Motability car.
After inputting that I had a thing come up saying something like “Motability account found” then goes on for you to create a personal account with your email address but I’ve not gone to this step yet.