It’s saying “account connection error” and that my bank is linked with another account but I’ve completely lost access to it. Is there a way for support to unlink it?

Hello @novaruuofficial-,

In QuickBooks Online, all data of your transaction, including the connection of your bank is based on the information provided by your financial institution. With this, I'd recommend contacting the Technical Support of your bank.

With their tools, one of the specialists can disconnect your bank account from the existing QuickBooks connection. This way, you can start a fresh integration and get back to working with your online transactions.

On top of that, I've also included this reference helpful with the resources needed for bank feeds and bank account reconciliations: Browse all articles for your QuickBooks product.

Drop me a response below if there are other things you need help with. I’m here anytime. Take care and stay safe!