Summary
It looks your iFrame macro has same name as iFrame macro in Adaptavist addon
https://marketplace.atlassian.com/apps/247/content-formatting-macros-for-confluence?hosting=server&tab=overview
After activating Adaptavist plugin your macro is disabled and cannot be use. Can you please let me know on how to solve it to be able to use both addons?
Steps to solve
Go to <YOUR CONFLUENCE URL>/plugins/servlet/upm#manage/com.adaptavist.confluence.contentFormattingMacros and
Expand the 135 of 145 modules enabled for the Adaptavist Content Formatting Macro;
Disable the module titled iframe (xhtml-iframe)
Then disable and re-enable our app.
Getting help
To get help contact our support.