Missing Transaction from my credit card transactions. Even when I reconcile, the transaction does not show up, and I know it is no longer pending in my credit card bill.

Hi , @pjennings808.

Welcome to the Community. I'm here to get you pointed in the right direction.
We recommend updating your bank account manually to get the most current view of your data.

Here's how to do it:

1. Go to Transactions menu, and then select the Banking tab.
2. Select Link account or Add account, and then select the Edit✎ icon.
3. Click the Update button located in the upper right.

You can check also by reviewing account's history: 

1. Go to the Accounting menu.
2. Select the Chart of Accounts tab.
3. Look for the bank account and select View register.
4. Look for the transaction. Select it to get more details.

For additional reference about categorizing downloaded banking transactions, read this article: 

• Assign, categorize, edit, and add your downloaded banking transactions.
• Reconcile an account in QuickBooks Online 

Please let me know if I can be of additional assistance by posting a comment below. Have a wonderful day.