Hello, jakmaartens.

I have some information about this issue.

There are various reasons why you’re getting a bank error 101. Here are the following:

• There is no valid account in online banking website which satisfies at least one of the criteria: non-zero balance amount transactions within the last 12 months
• When there is a prompt on your bank’s website that needs your confirmation (ex. terms and conditions).
• When there is some error in the script requiring a fix.

We currently have an ongoing investigation about the 101 error, and our engineers are working on fixing this issue as soon as possible. 

I recommend contacting our Customer Care Team. They can add your company information to the notification list, so you'll be updated once the issue is resolved.

Here are the steps:

1. Click the Help icon located in the upper right-hand corner.
2. In the Help window, click the Contact Us button located at the bottom.
3. Enter your question and click Let's talk.
4. Choose either Start a chat or Call us.

If you have the new QuickBooks Assistant help update, you can follow these steps:

1. In your QuickBooks Online account, go to the Help > Assistant.
2. Type Talk to a human and proceed with I still need a human.
3. Click the Contact us link.
4. Select either Messaging or Callback.

In the meantime, you can manually import your bank transactions by following the instructions in this article: Manually upload transactions into QuickBooks Online.

Once the issue is resolved and new transactions are downloaded in the Banking, you may see some duplicates. What you can do is exclude them by following these steps:

1. Go to Transactions > Banking.
2. In the For review tab, put a check mark on the duplicate transactions.
3. Click the Exclude button.

Here's a sample screenshot for a visual reference:

After excluding these transactions, you can delete them in the Excluded section.

Lastly, make sure to match and categorize your downloaded transactions. 

Thank you for your patience while we work on this. If you have more questions or other concerns, please do leave a reply below. I'm here to answer them. Have a great day ahead!