Textbox cursor color and highlight is only defined by accent color
Steps to reproduce the issue
set the accent color to #FFFFFF00 on the settings. Then on the textbox advanced properties,
set the cursor color to #000000FF. Set also the cursor color on the screen initialize event to #000000FF to ensure as well as the got focus event.
Yes Text box cursor color depends on the accent color. Whatever you select as your app’s accent color from project properties, it also sets text box cursor color. Changes are visible only in apk