Register Safe Domains
For security reasons, you’re not allowed to add external content to reports, embed your reports in other applications, or connect to some data sources (such as Dropbox and Google Drive) unless your administrator considers it safe to do so. Only administrators can register safe domains.
After you've registered a domain as safe, users need to sign out and sign back in to access content from that source.
Only authorized users may access the content. Users are prompted to sign in when they
access content on these safe domains, unless your service is set up with Single Sign
On (SSO).
Note:
There is a limit to the number of safe domains and individual settings that can be included in browser requests. To avoid reaching or exceeding this limit, add only the domains that you need and select only the options you know you require. Wherever possible, take advantage of wildcards to avoid multiple entries.