Resolve the zone cannot be upgraded error
When trying to upgrade a domain or purchase a subscription, you may see an error that contains one of the following phrases:
- "this zone cannot be upgraded"
 - "there is a problem with your billing profile"
 - "The zone you are trying to open a subscription for is banned"
 
- Your account may have an outstanding unpaid balance
 - Another account previously associated with the domain / zone your purchase relates to has an outstanding unpaid balance
 
This message appears when the account or domain involved has an outstanding unpaid balance. In the case of a domain, this may also be triggered by a previous account that owned the domain. To resolve this you will need to:
- Check each Cloudflare account you have access to for an outstanding balance. Refer to Email address and password if you have forgotten these details.
 - Refer to Pay an overdue balance to pay this balance
 - Wait 24 hours after paying this balance
 - Attempt to upgrade again
 
As a reference, the full error messages you may see are:
- "Refer to https://cfl.re/3VUQyyL ↗ for assistance. The zone cannot be upgraded at this time."
 - "failed to lookup account in db: Refer to https://cfl.re/3VUQyyL ↗ for assistance. For security reasons, there is a problem with your billing profile."
 - "could not run legacy post zone sub request against new zone products: failed to update user subscription: failed to load account from db: Refer to https://cfl.re/3VUQyyL ↗ for assistance. For security reasons, there is a problem with your billing profile."
 - "failed to load account from db: Refer to https://cfl.re/3VUQyyL ↗ for assistance. For security reasons, there is a problem with your billing profile."
 - "failed in ActionAppendSubscription: failed to update user subscription: failed to load account from db: Refer to https://cfl.re/3VUQyyL ↗ for assistance. For security reasons, there is a problem with your billing profile.
 - "failed in ActionAppendSubscription: failed to update user subscription: failed to apply object products: Refer to https://cfl.re/3VUQyyL ↗ for assistance. The zone you are trying to open a subscription for is banned."
 - "could not run a legacy post user sub request: failed to update user subscription: failed to load account from db: Refer to https://cfl.re/3VUQyyL ↗ for assistance. For security reasons, there is a problem with your billing profile."
 - "could not run legacy post zone sub request against new zone products: failed to update user subscription: failed to apply object products: Refer to https://cfl.re/3VUQyyL ↗ for assistance. The zone you are trying to open a subscription for is banned."
 - "failed to load account: Refer to https://cfl.re/3VUQyyL ↗ for assistance. For security reasons, there is a problem with your billing profile."
 - "could not run legacy post zone sub request against new zone products: failed to get account type: failed to load account from db: Refer to https://cfl.re/3VUQyyL ↗ for assistance. For security reasons, there is a problem with your billing profile."
 - "failed in ActionAppendSubscription: failed to get account type: failed to load account from db: Refer to https://cfl.re/3VUQyyL ↗ for assistance. For security reasons, there is a problem with your billing profile."
 
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