Hello,
Please check the offer types for the two subscriptions, It looks like access error, If one of the subscription is past of CSP then the cloud solution provider (CSP) partner must follow the steps shared in below document to enable the policy for cost view.
If the above dint work, you can engage azure subscription support team by following the steps here: https://learn.microsoft.com/en-us/azure/azure-portal/supportability/how-to-create-azure-support-request#go-to-help--support-from-the-global-header
Regards
Divya