Thank you for visiting again the QuickBooks Community and to provide details on what you've done to fix error 101. I'll ensure to share information about the error and how to get rid of this so you can get back to business in no time. Before we proceed, can I ask which specific bank are you using? I appreciate any further details so I can provide an accurate information.
To start with, error 101 is related to your account status and the updates rolled with your bank's website. With this, logging in to your bank's website and confirm all the acknowledgments is one way to fix this. To see additional information, you can refer to this article: Fix bank error 101.
Since you've already contacted your bank and confirmed that there is no problem on their side, I suggest reaching out to our QuickBooks Support Team. They have the tools to pull up your account and investigate the cause of the issue. Please note that they're only available M-F, 8:00 AM to 6:00 PM, SAST.