
This message means that the ASIN is not properly mapped to the brand. This is usually caused by inaccurate listing data on the ASIN.
How to access the A+ content page (Check the ASIN):
Go to Advertising > A + content Manager> Start Creating A+ Content > Create Basic> Provide Content Name (Test)> Put the ASIN in the Bulk Upload Bar
Step 1
Update the data by selecting Edit on that ASIN in your Manage Inventory and go to Vital Info and put the Brand name and all other required attributes.
Note: if you do not see the Brand Name under Edit Listing anymore, it would mean that the account already transitioned to Amazon's new Edit listing interface. In this case, skip step 1 and proceed to step 2 onwards.

Make sure that the brand name listed on the ASIN matches the brand name approved by Amazon's Brand Registry (case sensitive). These need to match 100%. Adding spaces or hyphens will lead to a mismatch.
Step 2
Download CLR and upload a FULL UPDATE on the ASIN
Important : Do not create a case before trying this method

NOTE: Double-check all the information before uploading the feed file
If the listing has more than 1 SKU - Make sure to update both of them
For example, if the listings have FBM and FBA.
Product ID must be the ASIN, PT, and ITK must be the correct value based on the category of the listing.
REVIEW THE SALE PRICE IF THERE IS A SALE PRICE IN THE BACKEND SINCE THIS IS NOT CAPTURED IN CLR
Update the “Update Delete” column to “Update” and save the file.

Wait until the inventory file is processed +15 mins and make sure it is uploaded successfully and keep the BATCH ID

Check if the ASIN is eligible for A+ content. (It might take 24 hours)

If not, You’ll have to open a case with seller support. Attach a screenshot of the error message saying that the ASIN is not eligible for A+ content.


Sample:
Amazon,
We are unable to add A+ content on our ASIN (Put the ASIN). It says it's not eligible.
It appears that our ASIN is not properly mapped to our brand name.
We uploaded a feed file with a full update but it hasn't fixed the issue.
Brand Name:
Batch ID:
See attached screenshot