Email approvals via the new iOS 26 apple mail are no longer working

Summary:

Some of our users have upgraded their iphone to the new iOS 26. Also the apple mail app is updated.
Purchase Order approval e-mails can no longer be approved.
Clicking on the Approve or Reject button is no longer possible. No action is done when clicking.

Was anyone able to resolve this issue? And how?

Content (please ensure you mask any confidential information):

Workaround is installing the outlook app and perform the approval via this app. But user needs to follow up his e-mails in 2 apps.

Version (include the version you are using, if applicable):

Version 25C.

Code Snippet (add any code snippets that support your topic, if applicable):