Good day, ebc-propertysolu.
Let me assist you in connecting your bank account.
The most possible reason for this error is because of a browser problem. You'll want to perform these steps to help in fixing this.
Let's start by using an incognito or private window and connect your bank from there. Also, please clear the cache since it causes issues in QuickBooks Online. Then, make sure that your Safari is updated.
In addition, you'll want to use another browser if you're still getting the same behavior. I suggest Google Chrome, Mozilla Firefox, or Microsoft Edge.
Here are some of the articles for your reference about banking:
Please comment again if you have more questions. Have a great day!