I cannot connect my QuickBooks cash account to my banking tab.

Hello @info-landshapr-c,

Thank you for taking the time to post in the Community. Let me share some information about the error message when connecting the QuickBooks Cash account.

Our product engineers received similar reports from other users experiencing the same behavior when connecting QuickBooks Cash with QuickBooks. We aren't able to give a specific timeframe when the issue will be fixed.

Rest assured, the engineers are doing their best to fix and prevent this from happening in the future. For now, I recommend contacting our QuickBooks Online Support Team so they can add you to our list of affected users.

This way, you can receive live email updates about this issue. To contact them, you can follow the below steps:

1. Click the Help option in the upper-right corner.
2. Select Get help from a human.
3. Choose Chat with us or Have us call you. 

Our Customer Support Team is available from 6 AM - 6 PM PT (Monday - Friday) and 6 AM - 3 PM PT (Saturday).

For future reference, I'm leaving the following article which you can use to learn more about how to transfer money in and out of your QuickBooks Cash account: Use your QuickBooks Cash account.

Thank you for your patience while our engineers are working on the resolution of this error. Please know that I'm just a post away if you have any other questions.