If you get an Opensaml Security error during validation message when trying to get into Realist, it is because your Chrome web browser does not have Flash enabled.
To enable Flash in Chrome, click the three dots in the upper right and then go down and click Settings:
Click the Advanced drop down arrow (on the left side of the screen), then click Privacy and security. Go to the middle of the screen and click Site Settings:
In the Permissions section, go down and click on Flash:
If you see the slider bar on the left side, that means your Chrome is blocking Flash on all sites:
Click the slider to move it to the right side (it will also turn blue):
That means that Chrome will ask you for permission when you go to a site that requires Flash. Here is what it looks like when trying to access Realist:
Just click Allow and you should be all set.