Plesk shows “Domain is not resolvable” message for the domain that resolves correctly

Symptoms

• The message below is shown for example.com domain in Domains > example.com under DNS Settings:
  
• The IPv4 and IPv6 addresses are configured for example.com domain in Domains > example.com > Web Hosting Access.

Cause

The example.com resolved to IPv4 but does not resolve to IPv6 address that is configured in Domains > example.com > Web Hosting Access.

The issue caused by the bug with id PPPM-12889 which will be fixed in future updates.

Resolution

Add  AAAA record on Registrar side.

If it is required to not use IPv6 use the following steps: 

1.  Log into Plesk.
2. Go to Domains > example.com > Web Hosting Access.
3. From the drop-down menu IPv6 address select None.
4. Scroll down and press the OK button to apply the changes.