Welcome to the Community, Eman.

To provide better clarity, could you kindly share screenshots of the GST Portion where the error is displayed? Any additional details and information you can provide would be highly appreciated.

Also, please be mindful and careful to not include sensitive information. This precaution is taken to prevent any potentially scheming activities.

In the meantime, to resolve this consider signing into your QuickBooks Online (QBO) account in a private or "incognito" mode to prevent interference from extensions, plugins, or cookies. Excessive cache buildup in your browser can lead to unexpected product behavior and may prevent you from completing your business info. This stems from prolonged cache storage, causing abnormal browser functions. Use these shortcut keys to access private mode across different browsers:

• For Google Chrome browser: Ctrl + Shift + N
• For Mozilla Firefox browser: Ctrl + Shift + P
• For Safari browser: Command + Shift + N

Once resolved, please return to your regular browser to clear its cache or utilize another supported one.

Additionally, I've included some articles for you, that can be great resources for managing and recording a GST payment in QBO:

• Report PAYG Withholding on BAS and IAS
• Recording a GST payment (BAS Payment) in QuickBooks Online

If you have more questions about managing your GST portion in QBO, feel free to reach out here in the Community. I'm here to help and just a comment away. Have a wonderful rest of your day!

Below is the screenshot attached

Thank you for providing a screenshot of the error, Eman. To ensure that this is is addressed promptly, I'll direct you to the appropriate team that specializes in resolving such matters.

I've verified access to the GST menu in my own account and it appears to be functioning correctly. Since you're still getting the error message even after initial troubleshooting, I suggest contacting our phone or chat support team for further assistance.

They have specialized tools that allow them to delve deeper into the issue and identify the root cause of the error.  Here's how to reach out to them:

1. Click the Help menu in the upper-right-hand corner of QBO.
2. Proceed to the Assistant tab.
3. Type in "talk to a human" in the chat box and press Enter.
4. Choose No, get me a human, then click Contact Us.
5. Choose between Callback or Chat.

Support hours also vary, depending on the day and type of plan:

• Phone support available during weekdays from 8:30 AM to 6:30 PM AEDT.
• Start a chat with a support expert available on weekdays from 7:00 AM to 10:00 PM AEDT. They're also open during weekends from 8:00 AM to 8:00 PM AEDT.
• QuickBooks Advanced weekend support is from 8:00 AM to 6:00 PM AEDT.

Let me share additional GST-related resources just in case you might need them:

•  BAS Detail Report
• Check how much GST you owe in QuickBooks Online

We're always here to provide assistance anytime you need help when collecting and filing taxes in QBO. The QuickBooks Team is open all the time to help.