There are times that your browser is full of frequently-accessed page resources, thus causing websites, like QuickBooks Online (QBO), to act weirdly. This can be the reason why the Get a Callback button from the Help menu seems not working as expected.
Before we proceed, can chase a brief description of your concern here so that offer you help while you're in the Community? Let's consider logging into your QBO account using a private browser so we can isolate this issue. To do so:
Lastly, here's are helpful articles you can read to learn more about how you can work well with your business in QuickBooks: Help Articles for QuickBooks Online.
If there's anything else that I can help you with, let me know in the comments. I'll be here to help.
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