PKCETokenRequest and Spotify Agreement

[djmikeystrange]

Operating System

Windows

My Question or Issue

Hello, I am using the Spotify API to developer a Windows UWP application. I'm using the PKCE Authorization work flow. It works as follows:
1. Start application

2. User is asked to login to spotify

3. After logging in, the user is taken to the screen where he agrees to grant my application access to view his spotify data.
4. The user agrees and proceeds to use the app
5. The user shuts down the app

When the user restarts the application the following happens

1. The user is NOT asked to login to Spotify again

2. The user is, however, asked to agree to grant my application access again

Is that right? I wouldn't expect that he would have to re-grant my application each time.

I was previously using the Authorization Code workflow and I didn't have to re-grant each time. The Authorization Code seemed to work well, but when I facebook authenticated I would get an "invalid_grant" every time I attempted to request a token.

I'm looking for any advice about what I might be doing wrong.  Thanks in advance for any help