Unable to connect to Paypal in banking menu after QB upgarde in 1st week of June 2021

Hello, mitesh2. 

Let's isolate this case by perform basic browser troubleshooting by clearing the cache to fix the issue.    

There are times that the browser is full of frequently accessed page resources, causing some unusual responses. We can start by accessing your account in a private browser. This mode doesn't save your searches, visited pages, log-in details, and cookies.    

You can use the shortcut keys that I've listed below.  

• Ctrl + Shift + P (Firefox) 
• Command + Shift + N (Safari) 
• Ctrl+ Shift + N (Google Chrome    

If it works, then you can go back to your original browser and clear the cache. Alternatively, you can use other compatible browsers. It could be that the one you're currently working on has a temporary issue with QuickBooks.  

Another way of refreshing the connection is to disconnect and reconnect the updated account. Before we proceed, make sure to add and match all the pending transactions in the Banking page. Disconnecting the automatic online banking updates will delete any transactions in the For Review tab. 

Here are a few articles that will help you manage your bank downloaded transactions: 

• Manually upload transactions into QuickBooks Online
• Disconnect or delete an account connected to online banking  

Please keep in touch with me here for all of your QBO needs. I'll always have your back. Thanks for coming to the Community and take care.