It can be anything! An apex, subdomain, or even a URL.

Results forwww.acs.secondplatformdev.com

Logged At	Not Before	Not After	Common Name	Matching Identities	Issuer Name
2020-11-17T20:07:49.595	2020-11-17T19:07:48	2021-02-15T19:07:48	acs.secondplatformdev.com	www.acs.secondplatformdev.com	C=US, O=Let's Encrypt, CN=Let's Encrypt Authority X3
2020-11-17T20:07:49.098	2020-11-17T19:07:48	2021-02-15T19:07:48	acs.secondplatformdev.com	www.acs.secondplatformdev.com	C=US, O=Let's Encrypt, CN=Let's Encrypt Authority X3
2020-09-18T20:51:09.703	2020-09-18T19:51:09	2020-12-17T19:51:09	acs.secondplatformdev.com	www.acs.secondplatformdev.com	C=US, O=Let's Encrypt, CN=Let's Encrypt Authority X3
2020-09-18T20:51:09.542	2020-09-18T19:51:09	2020-12-17T19:51:09	acs.secondplatformdev.com	www.acs.secondplatformdev.com	C=US, O=Let's Encrypt, CN=Let's Encrypt Authority X3
2020-07-20T21:26:34.816	2020-07-20T20:26:34	2020-10-18T20:26:34	acs.secondplatformdev.com	www.acs.secondplatformdev.com	C=US, O=Let's Encrypt, CN=Let's Encrypt Authority X3
2020-07-20T21:26:34.592	2020-07-20T20:26:34	2020-10-18T20:26:34	acs.secondplatformdev.com	www.acs.secondplatformdev.com	C=US, O=Let's Encrypt, CN=Let's Encrypt Authority X3