For past 2 weeks have not been able to connect to Nedbank on quickbooks online. It tells me to try add an account from another bank (code 155).

I appreciate you for sharing the details of your concern with us, Shady.

The error code you received on your end, means that your bank (Nedbank) isn't allowing QuickBooks to connect and retrieve your data. I'd suggest contacting your bank and verifying of any updates on their end.

You can also refer to this article for more details: Fix bank error 155.

In the meantime, you'll want to manually upload your bank transactions in QuickBooks Online (QBO). I'll show you how.

1. Sign in to your Bank website and follow the instructions to download the file as QBO, .CSV, or .QFX (maximum file size 350KB).
2. Then log in to your QBO and go to the Banking or Transactions menu.
3. Select Upload transactions or Upload from file.
4. Click the Drag and drop or select files box and select the file you downloaded from your bank. Then select Continue.
5. From the QuickBooks account drop-down, select the account you want to upload the transactions into, then click Continue.
6. Follow the onscreen steps to match the columns on the file with the correct fields in QuickBooks, then select Continue. 
7. Select the transactions you would like to import and click Continue. 
8. Click Yes to import the transaction and select Done.

Once you're all set, you might want to check out these resources that can guide you in flawlessly managing your accounts: 
 

• Categorise and match online bank transactions in QuickBooks Online
• Reconcile an account in QuickBooks Online

I'll be around if you need more help connecting your bank account in QuickBooks. Stay safe and have a wonderful day ahead!