REST API 401 authentication error when trying to connect to Watchful

We host this site and are trying to set it up on Watchful so we can monitor the site and apply automatic backups. When trying to get a connection to the site Watchful gets the error:

“code”: “rest_authentication_error”,
“message”: “Sorry, you do not have permission to make REST API requests.”,
“data”: {
“status”: 401
}

I’ve tried every troubleshooting option in Watchful’s knowledgebase, checked htaccess files, and tried multiple steps from the troubleshooting FAQ’s from WordPress but still can’t get the site to connect. Any insight as to what could be blocking the REST API call would be helpful.

The page I need help with: [log in to see the link]