Hi, @Maciekek, and welcome to our Netlify community site. It helps to use the actual domain names instead of example. DNS record are not secrets and can be queried by anyone anonymously. I encourage you to feel free to post the actual domain names at this will make troubleshooting simpler.
You can private message (PM) that to one of our support staff and I’ve confirmed that PMs are enabled for your community login. Note, that only one person can see the PM and this will likely mean a slower reply than posting the information publicly. Please feel free to reply to however you prefer though.
For the example,
xyz.com, I can see it is using AWS Route 53 with a check of the name server records:
The ouput at the URL above is (for me at this time):
flags QR RD RA
xyz.com. IN NS
xyz.com. 21599 IN NS ns-1418.awsdns-49.org.
xyz.com. 21599 IN NS ns-1664.awsdns-16.co.uk.
xyz.com. 21599 IN NS ns-32.awsdns-04.com.
xyz.com. 21599 IN NS ns-796.awsdns-35.net.
Would you please search for your domain’s name server (NS) records using that lookup tool above (or other tool of your choice)?
Does that lookup show these DNS servers below?
If not, my next recommendation would be to consult the documentation at ovh (or their support team) to find out how to change the NS records for your domain with their service. I think this in the correct documentation below:
If there are other questions about this, please let us know.