CCx is your platform to get the licenses you need. The following details provide instructions on how to cancel your Microsoft 365 (seat – based licenses), Software subscriptions and Perpetual Software purchases within CCx.
The Microsoft Cloud Care Client – Agreement contains the terms & conditions accepted when purchasing Microsoft cloud products in CCx, including detailed information on renewal and cancellation.
When a new Microsoft 365 seat-based license subscription is purchased or renews, Microsoft allows the cancellation within 7 calendar days (168 hours) from the time of order or renewal only.
How to cancel Microsoft 365 seat-based subscriptions:
On the Subscription detail page, you will see a link on the left called Cancel.
Cancel allowed until Date & time stamp (UTC) are displayed, if the Cancel button is greyed out, the cancellation window has closed.

After Microsoft closes the 168-hour window, they will not allow cancellation or license count reduction until the end of the subscription term.
The window for license count modification and/or cancellation will open again at the next renewal.
Click on Cancel to open the Cancel subscription window add the following information to proceed with the cancellation:

How to cancel Software Subscriptions:
Software Subscriptions follow the same 7‑day (168‑hour) cancellation window and cancellation process as Microsoft 365 seat‑based subscriptions.
Please note the following important conditions:
XXX - How to cancel Perpetual Software products:
Perpetual software products follow the same cancellation process described above. However, cancellations are only permitted within thirty (30) days of the order date.
After the 30‑day period has elapsed, perpetual software purchases are non‑cancelable and non‑refundable.