OVH

Connect to your Hosting Provider and find the "DNS Zone":

"DNS Zone" Dashboard

Add two entries with a "NS" pointing field

"Add an entry"

"NS" Record

In the first entry, add your subdomain that you chose earlier in your GTM setup and enter "ns1.gtm-helper.com" in the "target" field.

1st entry

In the second entry, do the same for the subdomain but enter "ns2.gtm-helper.com" in the "target" field

2nd entry