Upgrade from quickbooks online starter to essential error

Good day please help i want to upgrade but keeps on getting this error?

Have you tried open your account on private/incognito browser?

I appreciate your time in reaching out to us here, Abdawa.

We currently have an ongoing investigation about the error message when upgrading the subscription from Essentials to Plus. Our engineers are working on resolving the issue as soon as possible. 

While we're unable to provide a workaround, I recommend reaching out to our Customer Care Team. They can help add your company information to the notification list. This way, you will be updated when the issue is resolved.

Here's how:

1. Click the Help icon located in the upper right-hand corner.
2. In the Help window, click the Contact Us button located at the bottom.
3. Enter your question and click Let's talk.
4. Choose either Start a chat or Call us.

If you have the new QuickBooks Assistant help update, you can follow these steps:

1. In your QuickBooks Online account, go to the Help > Assistant.
2. Type Talk to a human and proceed with I still need a human.
3. Click the Contact us link.
4. Select either Messaging or Callback.

Once the issue is resolved, you can follow the steps in this article to upgrade: Upgrade or downgrade your QuickBooks Online subscription.

Thank you for your patience. If you have any other questions or concerns, please let me know in your reply. I'll be around to help. Stay safe!