Using of relative and absolute urls when create Modern Sharepoint site via PnP PowerShell

Modern Team and Communication sites can be created through PnP PowerShell cmdlet New-PnPSite. Here are examples how you may create these sites:

Team: New-PnPSite -Type TeamSite -Title Test -Alias test
Communication: New-PnPSite -Type CommunicationSite -Title Test -Url https://{tenant}.sharepoint.com/sites/test

Note that for Team site we use Alias parameter while for Communication site we use Url. It is mandatory to use relative url when you create Team site and absolute url when you create Communication site. If you will try to create Team site with absolute url:

Team: New-PnPSite -Type TeamSite -Title Test -Alias https://{tenant}.sharepoint.com/sites/test

you will get the following error:

Invalid value specified for property 'mailNickname' of resource 'Group'.

And if you will try to create communication site with relative url:

Communication: New-PnPSite -Type CommunicationSite -Title Test -Url test

there will be another error:

This operation is not supported for a relative URI.

Hope that it will help someone.