Owing to security issues as updated in the announcement:
Security updates to the platform - 19 May 2021,
Developer Platform will suspend supporting installation parameters made secure in the Request body
I would request you to change it accordingly.
Meanwhile, kindly create a support ticket at marketplace@freshworks.com to allow the app temporarily,
We need an account id, app ID for the same to unblock, but it is a temporary solution,
Hope it helps 
Thanks,
Santhosh