I'm trying to sign in to the QB Self-Employed app on Samsung phone. I fill in the email address I get an error:Unable to Sign In Parameter specified as non-null is null.

Hey there, @kaptonatus. 

We appreciate you coming here with your question. 

Since you've already restarted your phone, clear cache, and reinstalled the app, I recommend contacting our Customer Support Team for further assistance. Here's how: 

1. Go to the Help icon in the top right-hand corner. 
2. Click the Contact Us button. 
3. Enter your question and hit Let's talk. 
4. Scroll down and choose to Get a callback. 

Please keep us updated on how the call goes. I'll be waiting for your response!