Updating Issues

I’m having issues updating the app Procreate on my iPad. Whenever i try to update it, I’m asked to put in my Apple ID password. But after I put it in, it always says the verification failed. I double checked my password and made sure to put it in correctly, but it still failed. Then, I changed my password entirely and put it in again, but it still failed. I don’t know what’s causing this issue.