I'm here to help you connect your bank to QuickBooks Online (QBO), Gichukigithui.
May I know what specific error you received when connecting your Kenya Commercial Bank account? That additional detail is helpful so I can provide accurate steps to help you connect it.
In the meantime, I recommend logging in to your bank's website and checking if there are any messages or alerts that you need to take action immediately.
On the other hand, I suggest reaching out to your financial institution to verify if there are maintenance issue that affects the connection process of your bank to the program.