I tried to join a meeting without logging in but did not succeed, whether the SDK supports joining a meeting directly without logging in
yes, we support this.
you can call our Join API with APIUSER user type, if you want to join meeting without login.
joinParam.userType = ZOOM_SDK_NAMESPACE::SDK_UT_APIUSER;
ZOOM_SDK_NAMESPACE::JoinParam4APIUser& apiParam = joinParam.param.apiuserJoin;