Any idea what this is?

WhenDoesAppleWork wrote:

I click "move to trash" and the popup goes away but comes back 3-4 times a day now. I search for it and can't find anything.

https://discussions.apple.com/content/attachment/0c356405-b4b4-4354-a955-e181bf8b327b

I suspect you have installed adware/malware:

>System Preferences>Profiles click into it and then remove all the suspicious things from the list. (This Preference pane will not be present if no profiles found.)

Adware Removal Guide—Manual removal of : http://www.thesafemac.com/arg-identification/

or

Try running this trusted utility https://www.malwarebytes.com/mac/

also Verify you are not using SOCKS proxy:

>System Preferences>Networks>Advanced>Proxy uncheck the box

Adware/malware launch daemons can set SOCKS proxies without user participation.

(SOCKS is an Internet protocol that exchanges network packets between a client and server through a proxy server.)