I appreciate you for posting in the Community about utilizing QuickBooks Online (QBO) Desktop app, @andventer.
The QuickBooks Online Desktop app is no longer supported as of April 20, 2021, due to limited use. However, QuickBooks Online has a mobile app version to enable you to access your company anytime and anywhere. Additionally, it will be easy for you to send invoices, track expenses, etc.
You’ll want to check out this website to get it into your device: QuickBooks mobile app.
Let me know if you have more questions about any QuickBooks-related matters. The Community always has your back. Have a good one!