Hi Amanda, how are you?
Since this involves invoice and PO data, the quickest way to resolve this is to speak directly with the Atlassian Billing team through official support.
Access: https://support.atlassian.com/contact
Select the product you use (e.g., Jira, Confluence, etc.)
In the request type, choose the Billing / Payments / Invoices option.
Explain in the ticket:
Invoice number
Invoice date
PO number and date
That you cannot pay an invoice with a date prior to the PO
Ask them to reissue the invoice or adjust the date so you can pay before any deactivation.
If you are a site admin, you can also log in via the admin panel at: https://admin.atlassian.com/ and go to Billing to open a support ticket from there.
Usually, for cases with a risk of deactivation, they prioritize support, so it's worth mentioning in the ticket that your account is about to be deactivated.
If you've never activated the trial for your instance, activate it so you can get some time while you resolve your problem. I've had some issues with client instances and solved them this way.
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