Why would this happen?

Could be the account history or trust level, even if the ads are exactly the same

ppcvenom said:

I have two old ad accounts created around the same time, and I launched the exact same ad on both on the same day. Everything is identical, including the image, headline, caption, budget, targeting, and landing page. However, one ad was approved while the other was rejected. Has anyone experienced this before? What could be the reason behind this?

Click to expand...

This is quite normal for experienced advertisers; we need to understand that Facebook currently has a significant margin of error. You simply need to create a new campaign, and it will be approved.

ppcvenom said:

I have two old ad accounts created around the same time, and I launched the exact same ad on both on the same day. Everything is identical, including the image, headline, caption, budget, targeting, and landing page. However, one ad was approved while the other was rejected. Has anyone experienced this before? What could be the reason behind this?

Click to expand...

This issue happen on meta and other platforms as well. Ad reviews are not only based on the ad itself, but also on the account quality and history. Since you mentioned these are two old accounts, the previous ad history might also be a factor.
Also, AI review systems are not perfect and sometimes they can make mistakes or flag things incorrectly, you may try making some adjustments and testing again to see if the result improves

There are various other differences between the two accounts, including varying trust levels, and different IP addresses or domain names may also cause one ad to be rejected while the other is approved.