I appreciate you joining the thread about connecting the BMO Harries Bank with QuickBooks Online. Allow me to help provide information on this.
I've doubled-check the system, and we haven't received any reported issues from other users specific to connecting the bank. Can you share with me if you encounter any error message when attempting to download bank transactions?
I want to make sure you'll get the support you need to get back on track. Since you're unable to sync your BMO Harris bank for almost six months already, I recommend reaching out to our QuickBooks Support Specialists this time.
Please reach them by following these steps:
If you want to upload bank transactions manually, you can use the Web Connect feature in the meantime. I'm attaching the support articles I found helpful for you:
As always, get back to me if you need additional help or if you have further questions with connecting the bank. The Community has your back.