Digest tokens do not work with the mobile app UI, so you cannot use the Multi-Provider SSO plugin to log in with digest tokens for the mobile app.
Steps to Reproduce
Install the Multi-provider SSO plugin.
Configure the plugin to operate with digest tokens.
For more information, see the product documentation topic Set up digest token authentication.
Attempt to log in to your instance with the Andoid/iOS app.
Go to sys_property_list.do and ensure that you have enabled the system property glide.ui.m.helsinki_mobile_enabled.
Create a bookmark shortcut for the mobile device web browser.
For more information, see the product documentation topic Mobile UI.
The following video presentation provides an example of a mobile UI SSO login.
Related Problem: PRB1034641