The response is not a valid JSON response (2)

Hello,

We apologize for the issue you are facing with the JSON response. Thank you for raising this concern.

Since you’ve already tried disconnecting and reconnecting your account without success, we recommend checking if there are any plugin conflicts or issues with your server configuration that might be causing this problem. You can refer to our guide on confirming a theme/plugin conflict with Rank Math for more details.

If the issue persists, please reply to this ticket, and a human agent from the Rank Math Support team will take over and assist you further.

Thank you for your patience, and we look forward to resolving this for you!

Sources:
How to Fix Problems While Connecting Account Using Rank Math » Rank Math

Hello,

We have gone ahead and fixed this from our end.

You should see in your Rank Math dashboard that the plugin is disconnected from your rankmath.com account.

Please reconnect your Rank Math plugin to your Rank Math account. To do that, navigate to your WordPress admin area > Rank Math > Dashboard > Help, and reconnect your Rank Math account.

Then, head over to WordPress Dashboard > Rank Math > General Settings > Content AI and refresh the credits. Here’s a screenshot for reference:

Once done, please go back to using Content AI and it should work without any issues.

Hope that helps and please do not hesitate to let us know if you need our assistance with anything else.