Problem with Certificate on Android 14

Last week I build a update of our app for Android 14, and placed this app in the Google Playstore. Since then we have 4 clients with a problem connecting to their application server. In the Tomcat I saw log an error 400 and nothing else.
After investigation we noticed that all 4 clients used a certificate from the company ‘Trust Provider BV’. Is there anybody on this forum with the same problem?