I’m having the exact same issues.....
Since the Forum participants are almost all of us regular church members like yourself, if you're hoping for helpful suggestions from the Forum, it would be best to include more details. Things often mentioned in other posts include whether you previously were able to use the Tools app but now cannot; if you did anything specific right before it stopped working or if it happened suddenly; if you can sign onto other mobile apps like Gospel Library; if you can sign on to your church account at churchofjesuschrist.org; what OS your device is (iPhone, Android, other), etc. The more specific you are about your specific situation, the better chance you have of getting a specific suggestion from Forum members that might help you out.