Plug in is blocking me from adding American Express as an additional payment method and I can't unblock it. Any tips?
Welcome and thanks for posting in the Community, @danielle21.
To ensure that I'm on the same page, may I know which specific browser you're using? There are a few factors why we get this message. It could be the plugin components are corrupted or not updated, anti-virus is blocking some of the page processes, or the browser is damaged.
In the meantime, try signing into your QuickBooks Online (QBO) account using a private browser (incognito) as a workaround.
Press Ctrl + Shift + N (Google Chrome).
Ctrl + Shift + P (Firefox or Internet Explorer).
Control + Option + P (Safari).
If the issue persists, I highly suggest reaching out to an IT specialist or computer technicians for further assistance.
Just in case, I'll add these articles for future reference: