Drupal 8.x

I have installed Drupal 8.8.1 successfully, but get an error when I try to use Configuration Sync. I'm a Drupal newbie and cannot understand how to solve this error:

CONFIGURATION SYNC DIRECTORY Not present Your sites/drupal-8-8-1cj.dd/settings.php file must define the $settings['config_sync_directory'] setting as a string containing the directory in which configuration files can be found.

I also have a second error, I do not know if they are related (it doesn't sound to me like they would be):

We use Connect OpenID and Microsoft for Single Sign on. My problem occurs when a user clicks on a hyperlink in Microsoft Word. The user will sign on but the page returns access denied. The users permissions should allow them to access the page. They are able to access when the url is pasted into the browser. The problem is similar to the one described in this link: https://docs.microsoft.com/en-us/office/troubleshoot/office/click-hyperlink-to-sso-website.

I have a vocabulary TAG and common,speak and write are the terms listed.

Now when the user writes an article and he can tag the article with any of the above 3. So individually the url for those terms would be taxonomy/term/1 or 2 or 3. 

When I want to display all the articles of type common, I would use the above url. But my scenario is different.

There is an existing URL - www.example.com/prepare/common

In the TWIG template of my stores, I can render the address with the following code :

{{ store.address }}

How can I return only the postal code ?

Is there a tutorial somewhere that will help me get SSO set up for a Drupal 8 site?

I need to have Drupal registration that signs you into Moodle as well. I'm brand new to SSO so I don't even know where to start. Any tutorials would be great.