We're glad to have you here, kdf1245.

I'm glad you turned to the QuickBooks Community for help about activating a vendor in QuickBooks Online. Let's get this started.

You can activate an inactive vendor in a few easy steps. To do so, please follow these steps:

1. Go to Expenses and choose Vendors.
2. On the Vendors page, click the Gear icon.
3. Check the Include inactive box.
4. Look for the vendor you want to activate again.
5. Under the Action column, click on the Make active link.

I've added some screenshots to help you with the process of activating a vendor.

That's it. You should be able to reactivate a vendor again in QBO.

Please let me know if you have any other concerns and I'll be here to keep helping. Have a nice day.