Overview:
This article details the essential steps for locating licenses within the Admin Center, with a particular emphasis on perpetual licenses.
Process:
First Option (Check Billing Account)
Have the customer log in to their Microsoft 365 Admin Center account.
Click Billing in the left panel and select Your products.
On the viewing page, click on Change billing account.

On the right side of the screen, you should see the available billing accounts for your organization.
Select one of the available options and click Save.
If the licenses do not appear, try the other billing account.

Subtopic 1: Check Billing Profile
Process:
To manage or switch billing profiles, the customer must use the Billing → Billing accounts page in the Microsoft 365 Admin Center.
Sign in to the Microsoft 365 Admin Center.
Navigate to Billing → Billing accounts.
On the Overview tab, choose the billing account the customer wants to use.
On the billing account details page, select the Billing profiles tab.
Here, the customer sees all profiles linked to that billing account.
They can change the billing profile and see that the perpetual software is visible in that account.