I appreciate you performing some steps to ensure you'll be able to create a bill from the purchase order with no issues, @Stiens1.

However, since the issue persists, I suggest contacting our QuickBooks Support Team. They have the tools to pull your account and investigate the cause of the problem. To reach them, click the Help icon and select Contact Us to talk with a live agent. 

For future reference, you may visit our Help pages as your reference to guide you in managing your business's growth and transactions in QuickBooks Online: Community Self-help. It includes help articles, Community discussions with other users, and video tutorials, to name a few.

Please let me know if there's anything else I can do for you. I'll be here to help. Keep safe and healthy.