I am trying to upgrade my subscription but cannot do so online. I receive a 10003 error message that tells me to contact support

This isn't the kind of experience we want you to have while upgrading your QuickBooks Online (QBO) subscription, @userjdirik. That's why I'm here to share further details about this.

Currently, we have an ongoing investigation regarding the error you've received while upgrading your QBO subscription. Rest assured that our product engineers are actively working to have this resolved as soon as possible. This way, you can get back to business and utilize the features of your upgraded account.

In line with this, I suggest contacting our Customer Care team. They can add your account to the list of affected users. This ensures you're in the loop about the investigation's status and its fix. You can provide the INV-55099 to our representative as your reference.

In case you want to talk to one of our representatives to relay this matter, you need to request a callback. You'll first have to check out our support hours to ensure we can assist you on time. Here's how: 

1. Go to the Help menu.
2. Choose Contact Us. 
3. Enter your specific concern in the What can we help you with? field. 
4. Click Let's talk. 
5. Select Get a callback. 
6. Enter your contact details. 
7. Click Confirm my call. 

I've attached a screenshot below for your reference.

Also, you can check out this article to learn more about managing your payment and subscription information in QBO: Update billing, payment, and subscription info in QuickBooks Online. It also includes details about changing the billing cycle and viewing payment history.

Let me know how it goes in the comments below. I'm just around to help if you have other concerns about managing your QBO subscription and account. Take care always.

I got the same error but I have desktop so it looks different. How should I contact support?

Hello Randyb12430,

Let's have one of our Phone Support agents to take a look at your file and investigate what causes the error. You can follow the steps to contact them shared by my colleague.

I've also added this reference for the detailed steps to upgrade your plan: Upgrade or downgrade your QuickBooks Online subscription.

I'll be around if anything arises. Keep safe!

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Any specific issue?