Any idea why the transactions in one of my accounts completely sync and in another account only some transactions do?

Hello, sharonliebleinca.

Let's sort this out so we can fix this sync issue with your bank transactions.

There are possible reasons why you're missing your bank transactions in QuickBooks Online (QBO). Among these are the following:

• Some banks and credit card companies don't post transactions for download until later in the day or the next morning.
• Depending on which bank it will show a transaction on their website but won't download the transaction until it posts.
• If the missing transactions are the most recent ones, wait at least 24 hours in case your bank doesn't make them available immediately.

If you're using different bank to different QuickBooks account, you'll have to take note of the above mentioned.

If you're using the same bank account to both of your QuickBooks account, then you can update the other account where there are missing transactions. This will help refresh the connection between your bank and QuickBooks for updates to sync.

Here's how:

1. Go to the Banking menu,
2. Select Update. If you only want to update some accounts, select the unwanted ones, then select Update now.
3. If asked, enter your Multi-Factor Authentication (MFA) credentials. Then select Continue update.

You'd see your newly downloaded bank transactions in the For Review. Once you have reviewed and categorized your transactions, it will be added to QuickBooks. 

Transactions you’ve marked as duplicates or personal go to the Excluded tab. 

I've added these articles to help you resolve unexpected behavior when trying to update your bank transactions:

• What to do if you can’t find downloaded bank transactions
• What to do if you see a bank error or bank transactions won’t download

Keep me posted if you have other questions about connecting your bank with QuickBooks. I'm always here to help.

@sharonliebleinca 

Utilize the trial version of MT Online to isolate the issue. It is designed to import into any bank or credit card in QuickBooks Online, so there is no specific setting needed. If the same error persists, there is an ongoing problem at your bank or connection.

https://www.moneythumb.com/?ref=110