Thank you for choosing QuickBooks Online, @sallybennett1.

May I know the exact message you receive upon reconnecting your bank account to QBO, so we can give an exact resolution to your concern?

However, as a workaround, try reconnecting your accounts using your browser to have a better experience while accessing them.

You may also consider these reasons why your bank account is unable to reconnect:

• You to update your bank accounts before reconnecting to QBO.
• Reauthorize an expired bank account connection

You can check this article to follow the steps on how to review the transaction, disconnect, and lastly, reconnect accounts for your reference.

Moreover, refer to this link to know more information about the common error when reconnecting bank account and how you can fix it. 

Just hit reply for any other concerns. I’ll make sure everything will be sorted out for you. Enjoy the rest of the day!

When I reconnect the bank account it appears to be successful and I get the message saying "Sharing now set up", then I can see the connection progressing, then I get the message "Connection Complete".  But the screen then immediately goes back to this:

Actually, I am going to disconnect the account and reconnect it.  Hopefully that will work.

Thanks for getting back to us sallybennett1 - the 350 error relates to the expiry of the 90-day open bank authorisation period, and is usually fixed by performing a disconnect/re-connect. Please get back to us below if this doesn't work for you.  :) 

Sadly, disconnecting and reconnecting didn't work.  The account appears to have been shared but I am getting this message:

There's a problem with this account connection

Hi Sally, thanks for letting us so so error 355,

These are usually temporary errors that should self resolve within 48 hours. If the error persists, try following the steps listed in how to reauthorise your bank account to reconnect your account.

Please get back to us if you still have any problems after the 48 hours.