Google cannot fetch admin-ajax.php

I am having an issue on version 6.1.1. Google cannot fetch https://epicctrader.com/wp-admin/admin-ajax.php

Google search console URL Inspection says: “Page cannot be indexed: Blocked due to other 4xx issue”

This came about while trying to troubleshoot why ads I had running were suddenly disapproved for “malicious software”. Google themselves provided this url as the reason, saying “As per the recent scan of the website: https://epicctrader.com/price-earnings-ratio/ the below mentioned malicious links have been identified to interrupt our bots from crawling the content of your website:

https://epicctrader.com/wp-admin/admin-ajax.php”

I’ve tried disabling plugins, nothing so far has worked.

I see this is an issue that was raised by several users on a prior version of wordpress, also.

Thanks in advance for any help

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