Using Google Ad Manager (GAM) tag instead of Google Publisher Tag(GPT) tag


I have recently signed up for DFP for small business. When I go to my account and say generate tags, I get GPT tags. Ads get displayed when I use the generated GPT tags.

As per this answer on google, both tags work.

I used GAM style tags on my page, and ads don’t show up. A GET request to shows status message has a response code of 400 bad request.

What do I need to do in order to get ads displayed via GAM tags?

Any help is much appreciated.

Thanks and Regards,

oncalladops on google dfp help forum has answered my question. You can only use type of tags that you can choose from your account. Older accounts seem to have access to both GPT and GAM tags, while new ones have access to GPT tags.