The only way I know that this would work is having the password module add on in your ISC tenant. By default ISC does not keep record of a password.
We use Self Service Password Reset from Entra ID. This allows users to update their network password. And in turn can use SSO to login to ISC. The only thing about Entra ID is that you need to auto update the user record with an Email Address and Phone Number in order for SSPR to work.
When the user goes to update the password in Entra it will send notifications to both the Email and Phone number that user will have to enter before it allows for the password to be reset.
Hope this helps.