Hey there rosecapuz10-gmai,
Thanks for reaching out to us here and, Welcome to the Community! QuickBooks Online is a great tool to have, It helps keep your books balanced. It's important that you're able to continue with your QuickBooks goals. I can provide some information.
It may be browsing data on your system that is preventing the software from doing what it is supposed to do. Here are some steps to resolve issues that are caused by browsing data:
If you're still unable to sync your transactions, I recommend reaching out to the support team outside of the Community. They'll be able to verify your account details in a secure setting, as well as view your screen to better assist you. They also have the necessary tools to create a ticket to get the issue resolved if they see fit. You can reach them by following one of these methods:
Schedule a Callback or start a Chat: click (?)Help in the upper right > type and enter "Contact support" into the QB Assistant > click Contact Us > explain your situation > click Let's Talk > choose Get a callback or Start a Chat.
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If you have any other questions, feel free to reach out here.