May want to check on the web.conf in your app/default/ folder. If it doesn't exist, you can create one and add the configurations that you want within your app. iframe is disabled in Splunk 8 by default for security reasons.
https://docs.splunk.com/Documentation/Splunk/8.0.3/Admin/Webconf
[settings]
dashboard_html_allow_embeddable_content= true/false
dashboard_html_allow_iframes = true/false (default = false)
***** From the URL related to web.conf
dashboard_html_allow_inline_styles = <boolean>
* Whether or not to allow style attributes from inline HTML elements in dashboards.
* If "false", style attributes from inline HTML elements in dashboards will be removed
to prevent potential attacks.
* Default: true
dashboard_html_allow_embeddable_content = <boolean>
* Whether or not to allow <embed> and <iframe> HTML elements in dashboards.
* If set to "true", <embed> and <iframe> HTML elements in dashboards will not be removed
and can lead to a potential security risk.
* If set to the default value of "false", <embed> and <iframe> HTML elements will be stripped
from the dashboard HTML.
* Default: false
dashboard_html_wrap_embed = <boolean>
* Whether or not to wrap <embed> HTML elements in dashboards with an <iframe>.
* If set to "false", <embed> HTML elements in dashboards will not be wrapped, leading to
a potential security risk.
* If set to "true", <embed> HTML elements will be wrapped by an <iframe sandbox> element to help
mitigate potential security risks.
* Default: true
dashboard_html_allow_iframes = <boolean>
* Whether or not to allow iframes from HTML elements in dashboards.
* If "false", iframes from HTML elements in dashboards will be removed to prevent
potential attacks.
* Default: true
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