Soapbox Engage gives organizations the ability to use either a standard domain provided by Soapbox Engage, or a custom domain of their choosing (as an add-on option). When using the standard domain, it's always important to share links using secure URLs related to a Soapbox Engage account.
Correct URL format
https://prefix.secure.nonprofitsoapbox.com/...
Incorrect URL format
http://prefix.nonprofitsoapbox.com/...
("prefix" is Soapbox Engage account's prefix)