Microsoft.SharePoint.Client.InvalidClientQueryException – Microsoft Graph Site navigation

Currently I am using Postman with the {{environmental-variables}}.

I can navigate to through most of the sites with no issue.

https://graph.microsoft.com/v1.0/sites/{{sharepoint}}/sites/{{projects}}/sites/{{project-crm}}/sites/ 

Upon navigating to the the most child site

https://graph.microsoft.com/v1.0/sites/{{sharepoint}}/sites/{{projects}}/sites/{{project-crm}}/sites/{{final-site}]/sites 

It throws.

"error": {         "code": "-1, Microsoft.SharePoint.Client.InvalidClientQueryException",         "message": "The expression \"sites('xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx')/sites('xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx')/sites('xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx')/sites/xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx/sites\" is not valid.",         "innerError": {             "request-id": "xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx",             "date": "2019-07-23T19:27:05"         } 

Any help would be appreciated. Thank you.