WHY CANT I LINK MY KOHO MASTERCARD

Hi secchance83-outl,

Welcome to Community!  QuickBooks Online enables you to connect your bank and credit card accounts, so you can automatically upload your transactions and save valuable time.  However, we are currently experiencing an issue with the connection between Koho and QuickBooks Online.  This has been escalated for further investigation by our Development Team.  Although I can't provide an ETA for resolution, you can manually upload your transactions in the interim. by following the steps provided here.  This process can be somewhat overwhelming, if you've never done a manual upload previously.  For that reason, please don't hesitate to contact us.  It would be our pleasure to work with you in real time and navigate through the process, so you're back to business as soon as possible!

Schedule a Callback or start a Chat: click (?) Help in the upper right in QuickBooks Online > enter "Contact support" > hit Contact Us > provide a brief summary of your situation > hit Let's Talk > choose Get a callback or Start a Chat.
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Support hours are from Monday to Friday between 9 a.m. and 8 p.m. ET.
 

If you have any other questions or concerns, please feel free to reach back out.  We're here for you!

@secchance83-outl 

Try opening your QBO account on any private/incognito browser.