The request is refused because of the state of the account. The body is the standard error envelope with code 403, and message tells the two bodies apart.
ACCOUNT_ARCHIVED: the account was archived and its database was dropped. A request for this account is refused when it uses an API key, HMAC-signed or sent as a Bearer API-key token. A request with an OAuth access token for an archived account gets 401 instead. A cookie session is refused when every account the user holds was archived. Changing the subscription of an archived account is refused too. Support restores such an account by hand.
This account has been offboarded and report data access is no longer available.: the account was offboarded, and report data access is refused.
Other 403 refusals, such as a missing permission, use the same envelope with their own message.