According to ICANN requirements, a domain name's contact details must be verified within 15 days. Otherwise, it will get suspended until verification is completed.
If your domain is suspended due to a failed verification, the nameservers will change automatically to the registrar ones - on the DNS Checker Tool, it will look similar to this:
When this happens, all of your domain-related services, such as website and email, will stop working.
What to Do if the Domain is Suspended?
To unsuspend your domain, navigate to your Members Area and verify your domain. After successfully verifying your domain contact details, the nameservers will revert to the original values, triggering DNS propagation. Your domain will be back online in 24 hours or less 😊
Solving Possible Verification Issues
The verification email can take up to 15 minutes to arrive. If you have not received it after that time, check your Spam folder. If it’s not there, try resending the verification email.