Approvals in Microsoft Teams
In addition to reviewing and acting on approval requests via the automatically generated approval request emails, you can also do so within Microsoft Teams by installing Approvals in Microsoft Teams.
See the articles below for more information about Approvals in Microsoft Teams:
Canceling In Progress Approvals
An approval that is still in progress can be cancelled by the Request Submitter from within Approvals in Microsoft Teams. To do so, from the Sent tab in the Approvals app the user selects the approval they want to cancel and then selects the Cancel option. Only approvals that are currently in progress can be canceled.