Thanks for reaching out to this forum, mypract6. I've got insights to help rectify login issues in each of your devices.
When running QuickBooks Online (QBO) files within your regular browser, sometimes stored cache files can cause interruptions while using the program's feature. With this, let's make sure you've logged in as the primary admin of your company data. Then, we can perform troubleshooting steps to rule out the possibility of a webpage issue. Please refer to these keyboard shortcuts to open one on your desktop device:
Google Chrome: Ctrl + Shift + N.
Mozilla Firefox and Microsoft Edge: Ctrl + Shift + P.
Safari: Command + Shift + N.
If you've successfully signed in to your company, you can go back to the regular browser and clear its cache to remove the temporary files. You can also consider using other supported browsers to narrow down the problem.
We'll always be around in this thread whenever you need additional assistance managing your company accounts. Just let us know below, and we'll be sure to back you up. Keep safe.
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