In some rare cases, you already have a manifest.json file on your website. Since each website can only have one manifest, there is a chance it may conflict with the dynamic manifest file that is added by Aimtell.
If this is the case, there are two scenarios you may fall under.
If your manifest file doesn't have the "gcm_sender_id" field, simply edit it and add one. (You can either create your own or use ours)
For instance, let's say your existing manifest.json file looks like this:
"name": "Awesome Website"
Then you would update it to look like this:
"name": "Awesome Website",
If your manifest file already has a "gcm_sender_id", then you'll need to make sure this GCM id and it's corresponding key are specified in your dashboard. You can do this by logging into the dashboard and going to Websites > Edit > GCM/FCM keys
If you need any assistance, please reach out to firstname.lastname@example.org