Hi, Arslan Latif.

Thanks for getting back to us. I'm here to guide you to the right support so you can get the help you need. 

I appreciate you for taking the time to follow the other options and troubleshooting steps provided by @lynda and MikiD just to resolve this issue. In this case, I encourage you to get in touch with our Care Support Team to investigate this further. They can also create a new investigation for this issue and once it has been open, you’ll be receiving an email notification about the updates and progress.

Here's how to contact our phone support: 

1. Go to: Get help with QuickBooks Online.
2. Click the contact us link. 
3. Select the Search for something else, and type-in Customer Support. 
4. Click Search.
5. Scroll-down and click Get Phone Number. 

You may also check this article for additional reference: How to add a client to QuickBooks Online Accountant.

Please know that I'm just a post away if you have any other questions. Wishing you and your business continued success.