Please refer to this Microsoft document to Configure Microsoft Edge kiosk mode
https://learn.microsoft.com/en-us/deployedge/microsoft-edge-configure-kiosk-mode
Also check this similar case for a hint
So this happened after an update that added a new version of edge to C:\Program Files (x86)\Microsoft\Edge I just renamed the folder to C:\Program Files (x86)\Microsoft.bak and rebooted and it worked again
https://www.reddit.com/r/edge/comments/js9gr6/kiosks_running_old_edge_stopped_working/
Please note: Information posted in the given link is hosted by a third party. Microsoft does not guarantee the accuracy and effectiveness of information.
-------------------------------------------------------------------------------------
If the Answer is helpful, please click "Accept Answer" and upvote it.
Note: Please follow the steps in our documentation to enable e-mail notifications if you want to receive the related email notification for this thread.