À actually I did the test as well and installed a Trello Add-on which worked fine on my Smartphone but still not on my Huawei tablet. So I believe the issue is with Gmail App… But they did not answer any of my reports.
Also the Gmail App is presinstalled on the tablet and cannot be uninstalled just disconnected of your Google account. So even if I go to Android store and u install the app, the app icon remains display on my tablet but without any Google account linked. Am I clear?
I have thought uninstall the App using a file manager app that allow un installation of presinstalled app but have done yet the test.