Domain divinenailsalon.com not active after configuring CNAME and A records

There is a issue with the DNS configuration.

You have added Netlify name servers while still haveing Squarespace name servers

$ dig divinenailsalon.com NS
divinenailsalon.com.	4502	IN	NS	dns1.p04.nsone.net.
divinenailsalon.com.	4502	IN	NS	dns2.p04.nsone.net.
divinenailsalon.com.	4502	IN	NS	dns3.p04.nsone.net.
divinenailsalon.com.	4502	IN	NS	dns4.p04.nsone.net.
divinenailsalon.com.	4502	IN	NS	ns01.squarespacedns.com.
divinenailsalon.com.	4502	IN	NS	ns02.squarespacedns.com.
divinenailsalon.com.	4502	IN	NS	ns03.squarespacedns.com.
divinenailsalon.com.	4502	IN	NS	ns04.squarespacedns.com.

(this is also in whois divinenailsalon.com | egrep '^Name Server')

If you are wanting to use Netlify DNS (see [Support Guide] Should I use Netlify to manage my DNS?) you need to remove the Squarespace name servers.

Also when using Netlify DNS you do not configure A or CNAME records rather you assign a domain to a site and NETLIFY records are automatically created.

If you don’t want to use Netlify DNS you can configure external DNS (in this case remain using Squarespace DNS) which is when you use A and CNAME records (see [Support Guide] DNS Quick Start - How to set up DNS)

Currently requests for divinenailsalon.com and www.divinenailsalon.com are randomly handled by Netlify or Squarespace

$ dig divinenailsalon.com +trace
divinenailsalon.com.	3600	IN	SOA	dns1.p01.nsone.net. hostmaster.nsone.net. 1706600539 43200 7200 1209600 3600
;; Received 113 bytes from 2620:4d:4000:6259:7:4:0:1#53(dns1.p04.nsone.net) in 28 ms
$ dig divinenailsalon.com +trace
divinenailsalon.com.	3600	IN	SOA	dns1.p01.nsone.net. hostmaster.nsone.net. 1706600539 43200 7200 1209600 3600
;; Received 113 bytes from 45.54.22.1#53(ns01.squarespacedns.com) in 168 ms
$ dig www.divinenailsalon.com +trace
www.divinenailsalon.com. 14400	IN	CNAME	keen-hamster-47b88c.netlify.app.
;; Received 97 bytes from 198.51.45.68#53(dns4.p04.nsone.net) in 28 ms
$ dig www.divinenailsalon.com +trace
www.divinenailsalon.com. 14400	IN	CNAME	keen-hamster-47b88c.netlify.app.
;; Received 97 bytes from 45.54.22.1#53(ns01.squarespacedns.com) in 176 ms

Decide on either Netlify DNS or external DNS and follow the support guides and documentation to configure it.

Another great resource for all things DNS is