What Android version are you using?
What eBay app version are you using?
For info about getting the latest version of the eBay app, see here:
https://community.ebay.com/t5/Android-App/Android-app-not-supported-on-older-systems/td-p/30652449/j...
If you cannot use the app on your device, you should still be able to use a browser to go to ebay.com.
