Problem with ns servers

hello, my website domain is:
i had already used infinity free with another domain and i sussefully added name servers:

but this time, with the same domain register :
i had this problem:

the upper problem in red means in english:
The NameServers entered are not valid, you can check them via the page

i checked that website, which they mention and i see the servers are not working
try it

Please help me
Thank you

Could the problem be the same as what is described in this article?

Yes, already readed it and contacted my registar. They sad they couldn’t accept my NS manually so you have to make something. If you can’t i will have to close that domain and change it with .com so that i will not have problems.

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