Site still using the old name after rename and display name of alerts

[vasilisgr]

Hello,

a site already renamed with the new name (title and description) some weeks ago.
Although, all new alerts on that site & libraries still using the old name... 
All alerts still using the old name, event if I delete them and create them from scratch. 

It is a classic sharepoint site, not connected to o365 groups.

Title and description already modified. 

Any ideas how to resolve it (Noreply and alerts must use the new brand name) ? 

Thanks in advanced.

[#2]

Unfortunately no way to resolve this by yourself...this seems to be a bug in a SPO (To be honest, It's the first time I heard about it, but for sure I has been there for some time) so I would recommend to open a support ticket

[#3]

Thank you for your reply.

Following to o365 guides, I have to run (sharepoint Online Power shell) the following:

Set-SPOSite -Title "name" https://name1.sharepoint.com/name2

but there is a negative result:

Set-SPOSite : The site https://name1.sharepoint.com/name2 is not properly formed.
At line:1 char:1
+ Set-SPOSite -Title "name" https://name1.sharepoint.com/name2
+ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+ CategoryInfo : NotSpecified: (:) [Set-SPOSite], ServerException
+ FullyQualifiedErrorId : Microsoft.SharePoint.Client.ServerException,Microsoft.Online.SharePoint.PowerShell.SetSite

(Already connected Connect-SPOService -Url https://name-admin.sharepoint.com -credential username )

@Juan Carlos González Martín