The Stride app only tracks income that you enter into the app and is not connected to your employer. An income of $0 simply means that you weren't using Stride for this purpose!
The income tracking tool on Stride is meant to help you stay on top of how much you might owe in taxes throughout the year, but it only works if you submit entries.
The source of truth for your total income will be tax documents provided by the company you work for, such as a 1099-NEC!
If you'd like more information on how to track down your documents, check out this FAQ article: How do I find or receive my 1099 report?