Welcome to the Community forum, @groovy1. I'll be glad to share insight about generating account numbers in your Chart of Accounts. You'll have to turn on this feature so you'll able to generate an account number.

I've checked our records and found out that there's no reported issues about account numbers not generating in the Chart of Accounts. That said, let's make sure that you enable this feature. To do so, follow the steps below:

1. Go to the Gear icon, then select Account and Settings.
2. Choose the Advanced tab.
3. In the Chart of Accounts section, click the Edit (pencil) icon.
4. Check Enable account numbers and Show account numbers.
5. Click Save, then Done. 
   

Then, let's manually assigned the numbers to your accounts. Here's how: 

1. In the right-hand menu select Accounting and then Chart of Accounts.
2. Click the drop-down next to View register on an account and click Edit.
3. Enter the account numbers in the Number column.
4. Click Save and close once done. 
   
   

Now you can quickly find accounts using the numbers you assigned to them, whether you're searching in Chart of Accounts or adding a transaction.

For complete details, open this link: Use account numbers in your chart of accounts in QuickBooks Online.

You may also open an incognito window if the account numbers are still not generating. QuickBooks Online uses browser cache and cookies to run faster, but sometimes these can block web pages from loading like the account numbers. Just click on your browser below to find the steps for clearing these out:

• Firefox   
• Google Chrome
• Safari for Mac
• Safari for iPad and iPhone
• Microsoft Edge

If you're able to do so, go back to your regular browser and clear its cache. Close and reopen it after doing so. If you need to talk to our Customer Care Team, I'd recommend following the steps provided by my colleagues above. Ensure to call them within our support hours to ensure we address your concern immediately. 

To add up, I've got these articles to help you manage accounts in your COA:

• How to organize your chart of accounts.
• Learn about the chart of accounts in QuickBooks.

Feel free to swing by anytime if you have concerns with the account numbers in your chart of accounts or anything else. I'm more than happy to assist you. Take care.