Sometimes Facebook automatically blocks your ads because their algorithm detects some content that may not be allowed based on their policies.

It's important to understand why rejections happen. There is a list of reasons as to why a Facebook ad gets rejected.

1. Prohibited Content (This type of content is never allowed to run on Facebook)

• Discriminatory content practices

• Unsafe products

• Promotion of weapons and ammunition

• Promotion of tobacco and related products

• Adult services and content

• Cryptocurrencies

• Profanity

2. Restricted Content (This type of content is allowed to run on Facebook. However, there are various guidelines and policies that must be complied with for it to run)

• Subscription services

• Dating apps/services

• Prescription drugs

• Alcohol

• Social issues, politics-related content

• Cosmetic procedures

3. Misleading through ads

The landing page mentioned in your ad should be consistent and relevant. If your ad aims at getting traffic for an ongoing 50% sale on your website while it doesn’t really have the sale going on, the ad will be rejected. Misleading and manipulating ads leads to disapproval. Companies should never claim something they can't offer in terms of service and product.

4. Typos in Ads

All the ad links must be cross-checked so that none of them redirect people to a page 404 not found. The ad copies need to be proofed so that there is no grammatical error or typo. The ad copies must be precise, accurate, and compelling for the viewers.

For checking and asking for a manual review of the ad, you should go in here: https://www.facebook.com/business-support-home/ 

Or also you can follow these steps: https://www.facebook.com/business/help/1210227555661027

Once this request has been submitted, it usually takes 48-36 hours for Facebook to manually review your request.