Some sites don’t work well in the standard view in a mobile browser. When you find a site that works poorly in your mobile browser, you can switch your mobile browser to “Desktop Mode”, which shows the web page as if it were on a desktop PC. For example, recent changes to SSTA break approval on the mobile app/browser. HOWEVER, you can still do approval (or enter your hours), if you use your mobile browser in “Desktop mode.”
On iOS devises, you may find instructions here on how to access Desktop Mode.
On Android devises, you may find instructions here.